find the measure of vertical angle
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I am not sure what your question is asking, but here goes nothing... since both AB and AC are of equal length and have the same base BC. and we know that angle B is 55° we can say that angle C will also be 55° so, we have two angles, to find the third angle we can just subtract the sum of both angles from 180° so, angle A = 180-55+55
A= 70°
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