Question

Find the cosine of ∠B.
12
35
B
C
A
Simplify your answer and write it as a proper fraction, improper fraction, or whole number.
cos(B)=

Answer 1

Assuming the triangle is right with legs 12 and 35, the hypotenuse is sqrt(12^2+35^2)=sqrt(144+1225)=sqrt(1369)=37. For angle B the adjacent side is 12 and the hypotenuse is 37, so

cos B = 12/37.