Question

How do you solve the right triangle `ABC` if `a=20`m, `B=21^@`?

Answer 1

`ABC` if `a=20`m, `B=21^@`

I assume you are using standard labeling, so `C=90^@` and `A=69^@` and `a` is the side opposite `A` and so on.

Use `cos21^@ = 20/c` to find `c`.

and `cot21^@ = 20/a` to find `a`.