An isosceles triangle must have two equal angles.

Also, ANY triangle must have 3 angles that add up to 180 degrees.

If one angle is 80 degrees, there are 2 options:

A) One 80 degree angle, and 2 angles of 50 degrees each

B) Two 80 degree angles, with the 3rd angle being 20 degrees

Only one possibility with one 80 degree angle......

Mark H.

05/09/19

Jocelyn R.

I don't get it05/08/19