In a right triangle, angle C is a right angle and cos B = 255/257. What is the measure of angle A?
A) 7.2 degrees
B) 83.2 degrees
C) 82.8 degrees
D) 90.0 degrees
I have no idea, can someone help explain. Thanks!

Question

In a right triangle, angle C is a right angle and cos B = 255/257. What is the measure of angle A?
A) 7.2 degrees
B) 83.2 degrees
C) 82.8 degrees
D) 90.0 degrees
I have no idea, can someone help explain. Thanks!

mathmale · Answer

To get started here, draw the triangle in question.  Note that because the cosine of B is 255/257, the side ADJACENT to angle B is 255 and the HYPOTENUSE is 257.  If this cosine value is given, how would y ou work backwards to determine the angle between the adjacent side and the hypotenuse?

anonymous · Answer

I figured it out! But thanks, I gave you a medal anyways cause you took the time to answer and try to explain it to me