In ABC, ab^2 cos A = bc^2 cos B = ca^2 cos C. Prove that the triangle is equilateral.

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swer:

Step-by-step explanation:

ok then what happened.

c.

step-by-step explanation:

she should of added 9^2 and 12^2. that is because it is a^2+b^2=c^2. c^2 is the hypotenuse and should always be bigger than the other two numbers. which is why she should of added 9 squared and 12 squared together instead of 15 squared.