There is the Pythagorean relationship between the side lengths. Given a right triangle with sides a, b, & c : Sides a & b are adjacent to the right angle, and side c is opposite the right angle, and this side is called the hypotenuse.
Side c is always the longest side, and can be found by c2 = a2 + b2
The 2 angles (which are not the right angle) will add up to 90°
Given one of those angles (call it A), then sin(A) = (opposite)/(hypotenuse) {which is the length of the side opposite of angle A, divided by the length of the hypotenuse}
cos(A) = (adjacent)/(hypotenuse), and tan(A) = (opposite)/(adjacent).
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The Pythagorean Theorem is not a triangle. It's a statement that describes a relationship among the lengths of the sides in any right triangle.
Since the Pythagorean Theorem deals with the relationship among the lengths of the sides of a right triangle, it is altogether fitting and proper, and a fortuitous coincidence, that the variables in the algebraic statement of the Theorem stand for the lengths of the sides of a right triangle.
The hypotenuse is the side opposite to the right angle in the triangle.
They total 90o
A right triangle is a triangle with a right angle.a right triangle is a triangle with 1 side as a right angle