Question

Suppose cos(O) = 12/13, Quadrant I. Find sin(O).

A:13/12
B:5/13
C:13/5
D:5/12

Answer 1

B: 5/13

Explanation:

pythagoras theorem: a^2 + b^2 (sides) = c^2 (hypotenuse)

a^2 + 12^2 = 13^2

a^2 + 144 = 169

a^2 = 25

a = 5

sin = opp/hyp

sin 5/13

Hope this helps