![]() ![]() There are also special cases of right triangles, such as the 30° 60° 90, 45° 45° 90°, and 3 4 5 right triangles that facilitate calculations. It follows that any triangle in which the sides satisfy this condition is a right triangle. For any right triangle, the square of the length of the hypotenuse equals the sum of the squares of the lengths of the two other sides. Pythagorean theorem: The Pythagorean theorem is a theorem specific to right triangles.The sum of the lengths of any two sides of a triangle is always larger than the length of the third side. ![]() Another way to calculate the exterior angle of a triangle is to subtract the angle of the vertex of interest from 180°. The interior angles of a triangle always add up to 180° while the exterior angles of a triangle are equal to the sum of the two interior angles that are not adjacent to it. ![]()
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