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

Question

shadowlegendx · Answer

Distance Formula:

$$d = \sqrt{(x _{2} - x _{1})^{2} + (y _{2} - y _{1})^{2}}$$

shadowlegendx · Answer

An isosceles triangle has two congruent lengths

shadowlegendx · Answer

and itʻs base angles are congruent

shadowlegendx · Answer

Find the distance between each point. If two of the three answers are congruent, thatʻs one set of proof. If we do law of Cosines to figure out all the angles, we can confirm the base angles as well

anonymous · Answer

THANK YOU!!!!!!!!

shadowlegendx · Answer

The formula for Law of Cosines is as follows...

$$a ^{2} = b ^{2} + c ^{2} -2bc (cosA)$$

shadowlegendx · Answer

You got it?

anonymous · Answer

YES (:

shadowlegendx · Answer

Ok, let me know if you need help