Tangential and Radial acceleration - Sin and Cos simple question

[nukeman]

Homework Statement

Im confused about something. Ill post the answer sheet to a question. It has all the data you need. BELOW:

NOW... for Tangential component of the acceleration, WHY did they pick cos?

and for Radial, WHY did they pick sin? I am starting to do a lot of FBD to equations also, and having trouble understanding picking between sin and cos ?

Homework Equations

The Attempt at a Solution

 

[SammyS]

Cosine is adjacent/hypotenuse.

Sine is opposite/hypotenuse.

SOHCAHTOA