Question

1. Points D(-4, 6), E(5, 3), and F(3, -2) are the vertices of triangle DEF. Find the perimeter of the triangle.

Answer 1

use the distance form.

Answer 2

formulae

Answer 3

but i have 3 points?

Answer 4

Find the distance between:

DE
EF
and
DF

Add them. :) That is your perimeter.

To see why this is so, plot the three points on a piece of graph paper. (It will make the distance formula that much easier to apply because you can see directly the x-and y-distance between each pair of points.)

Answer 5

thanks(: