Question

If tan(theta) =1.5 and theta is in quadrant 3, what is
sin (theta)?

Answer 1

Tan(theta) = 1.5
= 15/10
=3/2 = P/B

H^2 = P^2 + B^2
= 3^2 + 2^2
= 9 + 4
H^2 = 13
H = √13

Sin(theta) = P/H
= 3/√13
As it is in 3rd quadrant,
Sin(theta) = - 3/√13