Two acute angles of a right-angled triangle are "Complementary Angles."
In a right triangle, the sine of one acute angle A is equal to the cosine of the other acute angle B. We know that these acute angles are supplementary angles because the sum of the measurements of these acute angles in a right triangle is 90°.
Two right triangles are similar by the similarity between their angles if they share the measure of an acute angle. Corresponding side length ratios in the triangle are the same. The ratio of the side lengths of a right triangle depends only on the acute angle.
A right triangle has one 90 degree angle and two acute angles (< 90 degrees). Since the sum of the interior angles of a triangle is always 180 degrees, the two sides of the right angle of the triangle are called the legs, and the opposite side of the right angle is called the hypotenuse.
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