# Prove that sina'=nsinb

## Homework Statement

look at the figure and prove that sina'=nsinb. We have given a, b, a', b' and n
http://s32.postimg.org/n7rnu0khx/image.png

sinb'/sina'=1/n

## The Attempt at a Solution

But in the equation we have b, not b'. I made the figure. How would the correct one be?

RUber
Homework Helper
Can you prove that ##\sin b = \sin b'##?

Can you prove that ##\sin b = \sin b'##?
No, only if the triangle has 2 equal sides

RUber
Homework Helper
Are the dashed lines making a and a' forming right angles with the sides of the triangle?