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What is the measure of the vertex angle of an isosceles triangle if one of its base angles measures 42° and its congruent sides each measure 9 cm? Please express your answer as a number only.

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2 answers
  1. If one base angle is 42, so is the other. And, the three angles total 180.

    The length of the sides does not matter.

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  2. Triangle XYZ is isosceles. The measure of the vertex angle, Y, is twice the measure of a base angle.

    What is true about triangle XYZ? Check all that apply.

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