Asked by lALA

Three ships are at points P, Q, and R such that PQ=2km PR=7 km, and
<QPR=142. What is the distance between Q and R, to two decimal places.

Answers

Answered by Reiny
direct application of the cosine law

d^2 = 2^2 + 7^2 - 2(2)(7)cos 142

solve for d
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