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    Trapezoid help?? angle b=143, angle c=9x-8. what is the value of x?

    I know easly how to get the angles, but I have no idea how they got x=5??!?!? what am i suppose to do? like how to work it out. In isosceles trapezoid ABCD, angle B is 143° and angle C is 9x-8°. What is the value of x and what are the measures of angle A and angle D? #1 x = 5 Angle A = 143°...
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