Question

With reference to the diagram, what is cosA?
A.0.250
B.0.447
C.0.558
D.0.894
E. 1

Answer 1

cos A = Ad / AB 
tan 26.57 = AB / 17.89
so AB = 17.89 * tan 26.57 = 8.9469
By pythagoras 
Bd = sqrt ( 17.89^2 - 16^2) =  8
AD =  sqrt (8.9469^2 - 8^2) =  4.006

cos A =  4.006/  8.9469 = 0.447

Answer 2

Hello there.

With reference to the diagram, what is cosA?

B.0.447