Law of cosines: a2 = b2 + c2 – 2bccos(a) what is the measure of p to the nearest whole degree? 35° 52° 57° 72°

57°

Given : In triangle PQR, the side PQ is 17, QR is 15, and PR is 14.

We use law of cosine formula

225 = 196 + 289 - 476 cos(P)

225 = 485 - 476 cos (P)

Subtract 485 on both sides

-260 = -476 cos(P)

= cos(P)

P =

P= 56.89202

So measure of angle P is 57 degrees

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