How do I answer number 3

Step-by-step explanation:

use the distance formula to find the lengths of all the sides of the triangle, if all of the sides are the same, its an equilateral. If the sides are different in this case it is a right. You can check this by using the Pythagorean theorem. the distance formula is the square root of (x2-x1)^2+(y2-y1)^2

for the coordinates make sure that you don't mix them up, if you pair the wrong coordinates up, it won't work

(x1,y1) (x2,y2)

72 is the answer to this problem