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

Using the distance formula we can determine the perimeter of PQR.

Distance formula: d=√ (x-x1) ^2 + (y-y1) ^2

distance of PR: √ (-2+2) ^2 + (9+3) ^2 = 12

distance of QR: √ (7+2) ^2 + (-3+3) ^2=9

distance of PQ: √ (7+2) ^2 + (-3-9) ^2 = 15

Perimeter: 12+9+15=36