The measure of angle A in the isosceles trapezoid is: 106°.
What are the Angles in an Isosceles Trapezoids?
In an isosceles trapezoid, the base angles are equal while the opposite angles are supplementary or have a sum of 180°.
The diagram given is an isosceles trapezoid. Therefor we would have:
m∠A = 180 - 74 [supplementary angles]
m∠A = 106°
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