The ratio of the opposite leg to the hypotenuse?

There are legs and hypotenuse only in a right-angled triangle. That is, one of the angles of the triangle is 90 degrees. The ratio of the opposite leg to the hypotenuse in a right triangle is called the sine of an acute angle. The ratio of the adjacent leg to the hypotenuse in a right-angled triangle is called the cosine of an acute angle.



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