Question

*.*.*.*.*.*I will give medal*.*.*.*.*.*

How can sine's rule be used in this???

Answer 1

You mean:
For any triangle ABC, \(\dfrac{\sin A}{a}=\dfrac{\sin B}{b}=\dfrac{\sin C}{c}\) ?

Answer 2

Find all letters.

Answer 3

Start with the Law of Cosines.

Answer 4

no i need sine rule

Answer 5

You have two unknowns that way. You need to start with Cosines to get it to one unnown, then use sines.

Answer 6

ok so can u help me out

Answer 7

So, do you know the Law of Cosines?

Answer 8

\[c ^{2}=a ^{2}+b ^{2}-2ab \cos C\]
\[c=\sqrt{(7^{2}+8^{2}-2(7)(8)\cos 50)}\]
\[c=6.404\]
is this right

Answer 9

I got 6.40373232694, so yah.

Answer 10

ok now i can do it thanks.

Answer 11

Now you can use that and sines to find \(\angle A\).