I need help with a geometry problem

Mathematics
Tutor: None Selected Time limit: 1 Day

Nov 13th, 2015

Thank you for the opportunity to help you with your question!

In isosceles triangle base angles are equal. So you have 2 angles that are equal to 70 . (140 deg in sum)

Sum of all angles in triangle = 180 , and for now you have sum of base angles = 140. 

So measure of vertex angle is 180-140 = 40 deg. 

Please let me know if you need any clarification. I'm always happy to answer your questions.
Nov 13th, 2015

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