Use a protractor and a straight edge
but bear in mind that knowing the three angles will not uniquely determine the triangle - the length of the first line will force a choice between infinitely many similar triangles.
An isosceles triangle
First: Sides are not acute or obtuse. ANGLES are acute or obtuse. An acute triangle has to have all angles acute. Examples: 60, 60, 60 70, 60, 50 45, 50, 85 45, 45. 90 30, 60, 90 But if one of the angles is obtuse (>90 degrees), then the other two must be acute. Of course, *this* triangle would not be called an acute triangle, because one of its angles is abtuse; it would be called an obtuse triangle.
30 degrees each
Cutting the equilateral triangle in half results in two right triangles each with a base of length x/2, and angles of 30, 60, and 90 degrees. Using the lengths of sides of a 30-60-90 triangle it can be found that the height is (x/2)√(3), which is the same as the height of the equilateral triangle.So the height of the equilateral triangle is x√(3) / 2.
It can be either acute or obtuse. An acute angle is less than 90 degrees and all 3 angles add to 180 degrees. For example, If two angles are 60 degrees (acute) then the 3rd is 60 degrees (acute). If two angles are 30 degrees (acute) the 3rd is 120 degrees (obtuse).
The triangle with angles measuring 110°, 40°, and 30° is classified as an obtuse triangle because it has one angle (110°) that is greater than 90°. The sum of the angles in any triangle is always 180°, which holds true in this case. Additionally, since all angles are less than 180° and greater than 0°, it is a valid triangle.
The 3rd angle has to be 110 degrees therefore it is an obtuse triangle
All triangle angles add up to 180, therefore subtract 30 and 80 (110) from 180. The remaining angle is 70.
An isosceles triangle has angles of 75, 75 and 30 degrees.
A right angles triangle, as one of the angles in the triangle is 90 degrees.
An obtuse angled triangle.
Total sum of angles in a triangle is equal to 180 degrees . Right triangle has a 90 deg. angle so 180-90= 90-30 = 60. The three angles are 90 60 and 30 degrees. == ==
70 and 80 degrees
Is a right angled triangle.
It is a triangle with 90, 60, and 30 degree angles.
It is an isosceles triangle.
It is an obtuse triangle