Question

Prove that the sum of the measures of the interior angles of a triangle is 180°. Be sure to create and name the appropriate geometric figures.

Answer 1

well,the easier proof is :

and that two lines are parallel to each othjer.

Answer 2

sry each other

Answer 3

and now you can :

Answer 4

sry use this figure:

x and y are parallel to each other

Answer 5

so angle C = angle A3 and angle B = angle A1 and A1 + A2 + A3 = 180

Answer 6

proved ;)

Answer 7

Thanks, but I think my question wanted me to do it in paragraph form. I didn't really understand. =P But, thank you! =)