Question 706010: Triangle DEF is isosceles. Angle D measures 20 degrees. what is the measure of angle E in degrees?
Answer by solver91311(24713)   (Show Source):
You can put this solution on YOUR website!
Depends.
You don't bother to mention which segment, DE, EF, or FD is the base, nor do you say which angle, D, E, or F is the vertex angle.
So you either have a vertex angle D that measures 20 degrees and two other angles that are equal in measure and the sum of all three is 180 degrees, or angle E has to be congruent to angle D.
John
Egw to Beta kai to Sigma
My calculator said it, I believe it, that settles it
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