The distance formula, d= √ (x2-x1)^2+(y2-y1)^2, is the key element in the proof of which of the following? a: the law of cosines b: cpctc c: the law of sines d: the triangle inequality theorem

I believe the answer is:

C. The law of sines

Hoped this helped!

hello i am doing good for you that it's summer in your country or state ; )

btw in my country we just have sun and rain as (because i live in the caribbean lol)

also, thx a lot for the points : )

rotation point l

step-by-step explanation: