Question

What type of triangle is formed by joining the points D(7, 3), E(8, 1), and
F(4, -1)?

Answer 1

help? @dan815

Answer 2

find distance of sides using d*d=(x2-x1)^2+(y2-y1)^2

Answer 3

@Hero

Answer 4

@perl

Answer 5

these are my choices

equilateral triangle
isosceles triangle
right triangle
acute scalene triangle
obtuse scalene triangle

Answer 6

if all sides equal then equilateral
if two sides equal isosceles
a^2=b^2+c^2 then right angle