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Since the internal angles of a triangle always add up to 180...

180=5x+3x+x is the same as 180=9x - therefore 180 divided by 9 equals 20.

The three angles are 100, 60 and 20 degrees respectively.

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How many acute angle in the letter A is?

Three, forming the triangle above the line. The two angles below the line are obtuse.


Why can a triangle have three acute angles?

A triangle can only have 3 acute angles because the triangle itself only measures to about 180 degrees. When you seperate the lines that make up the triange, you will notice that it does not pass 90 degrees. Anything below 90 degress, is understood as acute angles. Hope this helps! :)


What does isosceles triangle look like?

An isosceles triangle has at least two equal sides and two equal angles An isosceles triangle has two or more congruent sides called legs. In an isosceles triangle with just two congruent sides, the angle formed by the legs is called the apex, and the other two angles, called base angles, are congruent. If the isosceles triangle has three congruent sides (AKA an equilateral triangle), then all three sides and angles are congruent, and there are no definitive base or vertex angles, besides...all of them. See related link below for the web address


What is a acute trianlge?

an acute triangle is a triangle that has corner angles all below 90 degrees. there are three types of triangles: obtuse, right, and acute. obtuse triangles have one corner angle greater than 90 degrees, right triangles have one angle equal to 90 degrees, and acute triangles have all corner angles less than 90 degrees.


What ate the properties of a triangle?

SideSide of a triangle is a line segment that connects two vertices. Triangle has three sides, it is denoted by a, b, and c in the figure below.VertexVertex is the point of intersection of two sides of triangle. The three vertices of the triangle are denoted by A, B, and C in the figure below. Notice that the opposite of vertex A is side a, opposite to vertex B is side B, and opposite to vertex C is side c.Included Angle or Vertex AngleIncluded angle is the angle subtended by two sides at the vertex of the triangle. It is also called vertex angle. For convenience, each included angle has the same notation to that of the vertex, ie. angle A is the included angle at vertex A, and so on. The sum of the included angles of the triangle is always equal to 180°.Altitude, h Altitude is a line from vertex perpendicular to the opposite side. The altitudes of the triangle will intersect at a common point called orthocenter.If sides a, b, and c are known, solve one of the angles using Cosine Law then solve the altitude of the triangle by functions of a right triangle. If the area of the triangle At is known, the following formulas are useful in solving for the altitudes..BaseThe base of the triangle is relative to which altitude is being considered. Figure below shows the bases of the triangle and its corresponding altitude.If hA is taken as altitude then side a is the baseIf hB is taken as altitude then side b is the baseIf hC is taken as altitude then side c is the baseMedian, mMedian of the triangle is a line from vertex to the midpoint of the opposite side. A triangle has three medians, and these three will intersect at the centroid. The figure below shows the median through A denoted by mA.Given three sides of the triangle, the median can be solved by two steps.Solve for one included angle, say angle C, using Cosine Law. From the figure above, solve for C in triangle ABC.Using triangle ADC, determine the median through A by Cosine Law.The formulas below, though not recommended, can be used to solve for the length of the medians.Where mA, mB, and mC are medians through A, B, and C, respectively.Angle BisectorAngle bisector of a triangle is a line that divides one included angle into two equal angles. It is drawn from vertex to the opposite side of the triangle. Since there are three included angles of the triangle, there are also three angle bisectors, and these three will intersect at the incenter. The figure shown below is the bisector of angle A, its length from vertex A to side a is denoted as bA.The length of angle bisectors is given by the following formulas:where called the semi-perimeter and bA, bB, and bC are bisectors of angles A, B, and C, respectively. The given formulas are not worth memorizing for if you are given three sides, you can easily solve the length of angle bisectors by using the Cosine and Sine Laws.Perpendicular BisectorPerpendicular bisector of the triangle is a perpendicular line that crosses through midpoint of the side of the triangle. The three perpendicular bisectors are worth noting for it intersects at the center of the circumscribing circle of the triangle. The point of intersection is called the circumcenter. The figure below shows the perpendicular bisector through side b.Source: MATHalino

Related Questions

Determine the measure of the missing angle in the triangle below the sum of the three angles in a triangle is 180 degree?

37 degree


How many degrees do the 3 angles in a triangle add up to?

The 3 angles in a triangle ALWAYS add up to 180 degrees. Below are the different types of triangles: * Right triangle: one 90 degree angle * Equilateral triangle: All angles are the same (60 degrees) * Isosceles triangle: two angles are the same and two sides are the same * Scalene triangle: all three angles and all three sides are different * Obtuse triangle: one obtuse angle (angle greater than 90 degrees)


Exterior angle of a triangle?

Exterior Angle Theorem Exterior angle of a triangle An exterior angle of a triangle is the angle formed by a side of the triangle and the extension of an adjacent side. In other words, it is the angle that is formed when you extend one of the sides of the triangle to create a new line, and then measure the angle between that new line and the adjacent side of the original triangle. Each triangle has three exterior angles, one at each vertex of the triangle. The measure of each exterior angle is equal to the sum of the measures of the two interior angles that are not adjacent to it. This is known as the Exterior Angle Theorem. For example, in the triangle below, the exterior angle at vertex C is equal to the sum of the measures of angles A and B So, angle ACB (the exterior angle at vertex C) is equal to the sum of angles A and B. Recomended for you: 𝕨𝕨𝕨.𝕕𝕚𝕘𝕚𝕤𝕥𝕠𝕣𝕖𝟚𝟜.𝕔𝕠𝕞/𝕣𝕖𝕕𝕚𝕣/𝟛𝟚𝟝𝟞𝟝𝟠/ℂ𝕠𝕝𝕝𝕖𝕟ℂ𝕠𝕒𝕝/


How many acute angle in the letter A is?

Three, forming the triangle above the line. The two angles below the line are obtuse.


Which shape fits the description below A three-sided figure with one acute angle one right angle and one obtuse angle.?

A three sided shape is a triangle but the given angles are incorrect because a triangle can't possibly have a right angle and an obtuse angle because its 3 interior angles must add up to 180 degrees.


What is the measure of the largest angle in an obtuse triangle?

178 degrees is the largest angle for an obtuse angle because 180 is a straight angle and 90 degrees is an right angle and below 90 degrees is an acute angle. Some supposedly say that the answer is 179,But it's not! the reason behind this is because in a triangle all the angles have to add up to 180 degrees. There are 3 points to a triangle so there has to be 2 extra degrees taken off of 180, which equals to 178. Explanation is terms: angle A + angle B + angle C = 180 degrees [Sum of supplementary angles of a triangle] 178 degrees + 1 degree + 1 degree = 180 degrees which makes sense. I figured this out when i was doing homework... Hope this helps you other people


Can there be a triangle with all angles below 1?

yes


Why can a triangle have three acute angles?

A triangle can only have 3 acute angles because the triangle itself only measures to about 180 degrees. When you seperate the lines that make up the triange, you will notice that it does not pass 90 degrees. Anything below 90 degress, is understood as acute angles. Hope this helps! :)


If one angle of a triangle measures what is the measure of the third angle?

The sum of the three angles of a triangle is 180 degreesIf it is a right angle triangle one angle must be 90 degreesAll u have to do is 180-90- (the angle u already know)= unknown angle (third angle)Just like regular numbers, angles can be added to obtain a sum. Sometimes we can determine a missing angle because we know that the sum must be a certain value. Remember -- the sum of the degree measures of angles in any triangle equals 180 degrees. Below is a picture of triangle ABC, where angle A = 60 degrees, angle B = 50 degrees and angle C = 70 degrees.If we add all three angles in any triangle we get 180 degrees. So, the measure of angle A + angle B + angle C = 180 degrees. This is true for any triangle in the world of geometry. We can use this idea to find the measure of angle(s) where the degree measure is missing or not given.Sample AIn triangle ABC below, angle A = 40 degrees and angle B = 60 degrees. What is the measure of angle C?We know that the sum of the measures of any triangle is 180 degrees. Using the fact that angle A + angle B + angle C = 180 degrees, we can find the measure of angle C.angle A = 40angle B = 60angle C = we don't know.To find angle C, we simply plug into the formula above and solve for C.A + B + C = 180C = 180 - A - BC = 180 - 40 - 60C = 80To check if 80 degrees is correct, let's add all three angle measures. If we get 180 degrees, then our answer for angle C is right.Here we go:40 + 60 + 80 = 180180 = 180...It checks!You don't always have to plug in those values to the equation and solve. Once you're comfortable with this sort of problem you'll be able to say "okay, 40 + 60 =100, so the other angle has to be 80!" and it's much quicker.Sample BIf a triangle is equiangular, what is the degree measure of each of its angles?Remember, all angles of an equiangular triangle have equal measure. Let x = the degree measure of each angle. Triangles have three vertices and so we will add x THREE times.We have this:x + x + x = 1803x = 180x = 60Makes sense, right? If all the angles are equal, and they add up to 180, then it has to be 60 degrees!NOT USFULL TO LONG BIA


What does isosceles triangle look like?

An isosceles triangle has at least two equal sides and two equal angles An isosceles triangle has two or more congruent sides called legs. In an isosceles triangle with just two congruent sides, the angle formed by the legs is called the apex, and the other two angles, called base angles, are congruent. If the isosceles triangle has three congruent sides (AKA an equilateral triangle), then all three sides and angles are congruent, and there are no definitive base or vertex angles, besides...all of them. See related link below for the web address


Quadrilateral ABCD is a parallelogram in which angle A equals 40 degrees Which two angles below are complementary?

A and B, B and C, C and D, D and A, are all supplementary pairs. The figure has no complementary pairs of angles.


What does an isoscels triangle look like?

An isosceles triangle has at least two equal sides and two equal angles An isosceles triangle has two or more congruent sides called legs. In an isosceles triangle with just two congruent sides, the angle formed by the legs is called the apex, and the other two angles, called base angles, are congruent. If the isosceles triangle has three congruent sides (AKA an equilateral triangle), then all three sides and angles are congruent, and there are no definitive base or vertex angles, besides...all of them. See related link below for the web address