Question: In triangle PQR, PQ(vector) = 4i + j, PR(vector) = 6i 8j. a. Find the size of QPR, in degrees, to one decimal place.

In triangle PQR, PQ(vector) = 4i + j, PR(vector) = 6i − 8j.


a. Find the size of ∠QPR, in degrees, to one decimal place.


b. Find the area of triangle PQR.


P R

P R

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