Hello, 1st post.

A little help needed.

We're not allowed to use calculators, so if you could provide answers with working, great!

Sinθ = - 2/5 (negative two fifths) Range: π ≤ θ ≤ 3π/2 (π=pi)

Find Values for:

Cosθ

Tanθ

Im told i am to use the triangles, but i dont get how they work.

Help is appreciated.