SOLUTION: The measure of an exterior angle at vertex B of isosceles triangle ABC is 70�. The measure of a base angle of the triangle is (1) 110� (2) 70� (3) 55� (4) 35�

Question 920979: The measure of an exterior angle at vertex B of isosceles triangle ABC is 70�. The measure of a base angle of the triangle is (1) 110� (2) 70� (3) 55� (4) 35�
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
The measure of an exterior angle at vertex B of isosceles triangle ABC is 70�.
So the measure of the vertex angle is 90-70 = 20 degrees
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The base angles have equal measure, so::
2x + 20 = 180
2x = 160
x = 80 degrees (measure of each base angle.
Cheers,
Stan H.
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The measure of a base angle of the triangle is
(1) 110� (2) 70� (3) 55� (4) 35�
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