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How do I know to use the sine law or cosine law for a right angle triangle?

sml0920

wrote...

Posts: 101

Rep:

11 years ago

How do I know to use the sine law or cosine law for a right angle triangle?

I mean for a non right triangle

Read 801 times

3 Replies

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Replies

rkoch

wrote...

#1

11 years ago

If the question involves 2 sides and 2 angles, you use law of sines. If the question involves 3 sides and 1 angle, you use law of cosines.

fishtaco

wrote...

#2

11 years ago

If you have 2 angles (you can calculate the third one) and one side, then use the sine law in order to find the other two sides.

If you have one angle and two sides, then use the cos law in order to find the third side.

tomocha

wrote...

#3

11 years ago

Select the one in which there is but one unknown.

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