all the angles add up to 180 degrees
pythagorean theorem. if it works, you have a right angle triangle. a^2 + b^2 = c^2. the sum of the squares of the two shorter sides is equal to the square of the longest side, also known as the hypotenuse.
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the only way for a right triangle to have a line of symmetry, is if the legs of the triangle are congruent. Or you can show that both non-right angles are congruent (45 degrees). you may also prove that the altitude of the triangle bisects the hypotenuse or that it equals 1/2 of the hypotenuse.
For any right angle triangle its hypotenuse when squared is equal to the sum of its squared sides.
If a triangle has a right angle, it is a right triangle.
yes it is it is a triangle with a right angle in it
That would be a right triangle. Any triangle that has a right angle in it is a right triangle.