Use the sine rule in any triangle
What's the sine rule?
a/Sin A = b/Sin B = c/Sin C
Sin A/a = Sin B/b = Sin C/c
Where side a is opposite angle A, side b is opposite angle B, side c is opposite angle C.
What do we use it for?
The Sine Rule is a more advanced formula that be used to find missing sides and angles in any triangle, whether it has a right angle or not.
When can we use it?
You will be given a side and its opposite angle.
If you are a given another side, you can calculate its opposite angle using the Sine Rule.
If you are given another angle, you can calculate its opposite side using the Sine Rule.
a = 4cm
A = 40o
b = 3cm
What is B?
4/40 = 3/B
Rearrange this to get
B = 3 x 40/4 = 30
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