Help me...................
1 answer:
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we know that
In the <u>isosceles trapezoid</u> of the figure, the angles on either side of the bases are the same size/measure (congruent), and adjacent angles (next to each other) along the sides are supplementary.
so
m∠A=m∠B=3x
m∠D=m∠C=9x
m∠A+m∠D=
Substitute
therefore
<u>the answer is</u>
the value of x is equal to