Question

what is the perimeter of triangle ABC with vertices A(-2,9), B(7,-3), and C(-2,-3) in the coordinate plane

Answer 1

a) 21 units
b) 15 units
c) 34 units
d) 36 units

Answer 2

Use the distance formula to find the length of each vertex

Answer 3

I don't know how

Answer 4

distance between (a,b), (c,d):
sqrt( (a-c)^2 + (b-d)^2 )

Answer 5

for example, distance between A(-2, 9) and B(7, -3):
sqrt( (-2-7)^2 + (9-(-3))^2 )
= sqrt( 81 + 144)
=sqrt( 225)
= 15

Answer 6

do that for vertices BC and AC, then add all of them together