three angles known of triangle and 1 length known how do I find the other lengths of the triangle 

Guest Jun 6, 2017

2+0 Answers


Let's say we know angle A, B, C and we also know side a

First, try doing tanA= a/b

Find side b

Then do sinB=b/c

Find side c.

All info is now known.

rarinstraw1195  Jun 6, 2017

Rarinstraw's answer is correct if the triangle is a right triangle with C as the 90ยบ angle, but if the triangle is not a right triangle, you can use the Law of Sines to find other two lengths.


The Law of Sines says:


\(\frac{a}{\sin A}=\frac{b}{\sin B}=\frac{c}{\sin C}\)


where  ,  ,  and   are angles, and  ,  , and  , are sides across from their respective angles.


This might help: https://www.mathsisfun.com/algebra/trig-sine-law.html    smiley

hectictar  Jun 6, 2017

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