# Aiming Trig

• August 31st 2009, 08:42 AM
dvid
Aiming Trig
Is it possible to find angle A of triangle ABC knowing length of AB, angle B, values of s and v, and when length of BC=st and length of AC=vt?
• August 31st 2009, 10:27 PM
Sine Rule
Hello dvid

Welcome to Math Help Forum!
Quote:

Originally Posted by dvid
Is it possible to find angle A of triangle ABC knowing length of AB, angle B, values of s and v, and when length of BC=st and length of AC=vt?

Yes, it is. Using the Sine Rule:

$\frac{a}{\sin A}= \frac{b}{\sin B}$

$\Rightarrow \sin A = \frac{a\sin B}{b}$

$= \frac{BC \sin B}{AC}$

$= \frac{st\sin B}{vt}$

$= \frac{s \sin B}{v}$