# PreCalc

posted by John

QP is (x y) = (3 -1) + r (14 10)
QR is (x y) = (3 -1) + s (17 -9)
PR is (x y) = (0 18) + t (5 -7)
where r, s, and t are scalars.

1. Use vector methods to find the coordinates of P, Q, and R.

2. Find vectors PQ and PR and evaluate PQ*PR
3. Find size of QPR
4. Find the area of triangle PQR

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