What does the law of cosines reduce to when dealing with a right triangle?

A. The law of cosines cannot be applied to a right triangle
B. The formula for a triangle's area
C. The Pythagorean theorem
D. The law of sines

I think it is C. The Pythagorean theorem.

Question

What does the law of cosines reduce to when dealing with a right triangle?

A. The law of cosines cannot be applied to a right triangle
B. The formula for a triangle's area 
C. The Pythagorean theorem
D. The law of sines

I think it is C. The Pythagorean theorem.

welshfella · Answer

HinT:-   the cosine of 90 degrees is 0

welshfella · Answer

You are right because the last part reduces to zero