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If it has one 90 degree angle then it is a right triangle.

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Q: How do you know if a triangle is a right triangle?
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Related questions

A triangle with one right angle?

A triangle with 1 right angle is a right angle triangle.


What shape has three sides that are not equal but have a right angle?

with the three sides you know it will be a triangle, it is a right triangle, it is not an equilateral triangle or an isosceles triangle... so it must be a right scalene triangle


What do you call A triangle with a 90 degrees angle?

Any triangle with a 90 degree angle is called a right triangle.


How do you know if a triangle is a right triangle by it's sides?

C2=a2+b2


How do you use pythagaoras theorem?

If you know any two sides of a right triangle, you can calculate the third by Pythagoras' Theorem.If you know any two sides of a right triangle, you can calculate the third by Pythagoras' Theorem.If you know any two sides of a right triangle, you can calculate the third by Pythagoras' Theorem.If you know any two sides of a right triangle, you can calculate the third by Pythagoras' Theorem.


How do you know when a triangle is 90 degrees?

we know that a triangle is 90 degrees by measuring its length or it can be known as right triangle which measures 90 degrees.


How do you know a triangle in an obtuse triangle?

you know a triangle is obtuse when it is larger than a right angle which is 90 degrees. ex. a clock when it is 12:15 it makes a right angle or 90 degrees.


How do you work out what the smallest angle is in a right angled triangle?

It depends on what else you know about the triangle.


Why do they call a triangle a right triangle?

right angle=90 degrees and a right triangle has one side of it that forms a 90 degree angle...as for the naming "right" don't know but it refers to 90 degree angle


How do you know when its a right triangle?

It will have an L shape flipped around at the corner. or you can use a protractor or type in google images 'right angle triangle' they will have an L shape at the corner of the right angled triangle.


How do you know if a triangle is a right triangle using the pythagorean therom?

We know that a right triangle is a triangle having a right angle, where the side opposite the right angle is the hypotenuse, and the perpendicular sides are the legs of the right triangle. The Pythagorean theorem gives the relationship between the lengths of the sides of a right triangles. In the case where you know only the measure lengths of the sides of a triangle, you need to test these measures. If one of the sides of the triangle has a square measure equal to the sum of the square measures of two other sides, then this side is called the hypotenuse and opposite to this side is a 90 degree angle, which is a right angle. So, you can say that this triangle is a right triangle. Pythagorean triple are very helpful to determine a right triangle, such as: (3, 4, 5), (5,12,13), (8, 15, 17), (7, 24, 25), and (20, 21, 29).


How do you find the length of a side in a triangle that is not a right triangle?

Use either the Sine or Cosine rules depending on the information you know about the triangle.