What does the law of cosines reduce to when dealing with a right triangle? a. the pythagorean theorem b. the formula for a triangle's area c. the law of sines d. the formula for a triangle's area

Cosine law formula is:



where A is an angle opposite from side a.
If angle a is 90 degrees that means that cos(90) is 0 which leaves us with


This is Pythagoras theorem where a is the hypothesis and b and c are smaller sides of triangle

Answer is A)