Question

PLEASE HELP!!!! The vertices of triangle DEF are D(7, 3), E(4, -3), and F(10, -3). Write a paragraph proof to prove that triangle DEF is isosceles.

Answer 1

The definition of an isosceles triangle is 2 sides are the same length. You can use the distance formula to calculate each side length to show that 2 of them are equal length.

Answer 2

would that be d=the square root of (x2-X1)^2+(y2-y1)^2?

Answer 3

to find the lengths yes

Answer 4

isosceles triangles the 2 base angles are also equal

Answer 5

Thank you!