How can you prove a triangle is a right triangle?

Answers

If the triangle has a right angle (90° angle) it is a right triangle.

hope this helps :)
If the side lengths (arranged from shortest to longest) have values of a, b, and c, and a²+b²=c², then the triangle is a right triangle.
If the angel is 90 Degrees 
B.
A right triangle means one of your angles is 90°

Therefore you can prove your triangle is a right triangle by showing one of the angles is 90°

second choice

Step-by-step explanation:

Right angle has a 45 degree angle which is perpendicular.

Number 2 would be the correct answer

Let's see what the answer choices mean with respect to the requirement to prove a triangle is a right triangle.

a) two sides are congruent: the triangle is isosceles, but not necessarily a right triangle.

b) two sides are perpendicular: the triangle must be a right triangle.

c) three sides are congruent: the triangle is equilateral so is definitely not a right triangle.

d) sides are parallel: the figure cannot be a triangle.

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The appropriate choice is the second one ...

... Use the slope formula to see if any sides are perpendicular.

B. Use the slope formula to see if any sides are perpendicular

The best way to prove that a triangle is a right triangle is to use the Pythagorean theorem because the Pythagorean theorem only works with right triangles. If a^2 + b^2 = c^2, then you are looking at a right triangle. 


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