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Q: What is the measure of the vertex angel of an isosceles triangle if one of its base angles measures 42 degress?

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63

yes

57.5 degrees

An Isosceles Triangle

(180 - 38)/2 = 71 degrees (base angles of an isosceles triangle are congruent).

84 degrees

84 degrees

40

You are an isosceles triangle.

80 degrees.

63 degrees

40 degrees each

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