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Algebra 12 Online
OpenStudy (anonymous):

What is the measure of the vertex angle of an isosceles triangle if one of its base angles measures 54° A) 126 B) 72 C) 63 D) 108

OpenStudy (anonymous):

Total sum of angles is 180, triangle is isocele, sum of two first angle is 108 and vertex is 72 degres.

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