Angle upper A upper C upper B is a right angle. The length of side upper A upper B is

Question

What is the value of $\cos A$ in the triangle shown?

Accepted Answer

Choice B is correct. The cosine of an acute angle in a right triangle is defined as the ratio of the length of the leg adjacent to the angle to the length of the hypotenuse. In the triangle shown, the length of the leg adjacent to angle A is 41 , and the length of the hypotenuse is 42 . Therefore, cos A = 41 42 . Choice A is incorrect. This is the value of 1 cos A . Choice C is incorrect and may result from conceptual or calculation errors. Choice D is incorrect and may result from conceptual or calculation errors.

Question angle-