Plot tyhe points, and use the distance formula to find the sides.
For example, if the points are ABC, then
AB = √((-3+9)^2 + (-6+3)^2) = √(36+9) = √45
find the other two sides and add them up.
Or if, as I suspect C = (-9,-4), then you have a right triangle, and the legs are easy to find the lengths. Then just find the hypotenuse and add 'em up.
Find the perimeter of the triangle whose vertices are the following specified points in the plane.
(−9,−6),(−3,−6) and (9,−4)
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