Question

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

Answer 1

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

Answer 2

Don't you know the formula for calculating the lengths.

Answer 3

\[d=\sqrt{(x _{2}-x _{1})^{2}+(y _{2}-y _{1})^{2}}\]

Answer 4

You have three points so you should use this equation three times.