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OpenStudy (natalie1234):
What is the measure of a base angle of an isosceles triangle if its vertex angle measures 30°?
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OpenStudy (natalie1234):
A. 150° B. 75° C. 30° D. 15°
OpenStudy (isaiah.feynman):
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OpenStudy (isaiah.feynman):
Isosceles triangles have two congruent sides, thus angles opposite those sides are congruent too.
OpenStudy (isaiah.feynman):
It is also known that the sum of angles in a triangle is 180 degrees. So,
OpenStudy (isaiah.feynman):
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