What is the perimeter of PQR with vertices P(–2, 9), Q(7, –3), and R(–2, –3) in the coordinate plane?

Answer 1

Use your distance between 2 points formula to find the 3 sides, then add them up

I will do one of them
PQ = √( 7-(-2))^2 + (-3-9)^2 )
= √(81 + 144) = √225 = 15