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Find x. Complete the explanation. 1149 Yo By the definition of supplementary angles, the base angles of the top isosceles triangle have a measure of 66 . Therefore, the measure of the vertex angle is by the Triangle Sum Theorem. The base angles of the bottom isosceles triangle will also have a measure of by the Vertical Angles Theorem. Thus, x9, which is the bottom isosceles triangle's vertex angle, will equal