SOLUTION: What is the measure of each base angle of an isosceles triangle if its vertex angle measures 42 degrees and its 2 congruent sides measure 21 units?

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Question 346654: What is the measure of each base angle of an isosceles triangle if its vertex angle measures 42 degrees and its 2 congruent sides measure 21 units?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
The sum of the angles in a triangle equals 180.
X%2BX%2B42=180
2X=138
X=69degrees