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OpenStudy (anonymous):
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OpenStudy (anonymous):
If BC = AC, then you have an isosceles triangle. Angle B will be equal to angle A. Check the wikipedia article for Isosceles Triangle for Proof and illustration.
OpenStudy (amoodarya):
180 -(21+21)=138
OpenStudy (anonymous):
Angle C will be 138, angle A and angle B will be 21°
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