Question

how do I find the the perimeter of a triangle in a coordinate plane

Answer 1

To find the perimeter of a triangle, you need to find the length of each side and add all of them to find the perimeter. To find the distance between two points you use the distance formula with d as the distance between two coordinates, (x1,y1) and (x2,y2). , Hope this helps. 

Answer 2

To find the perimeter of the triangle you have to find the number for the base and the sides. Then add them all up and you have your perimeter.