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In this parallelogram, the measure of     angle b    exceeds the measure of   angle a by 30        What is the measure of  angle c

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angle a +angle b = 180 degrees
angle a + angle a + 30 = 180
2*angle a = 150
angle a = 75degrees
angle b = 75+30 = 105 degrees
now, angle b +angle c = 180
so, angle c = 180-105 = 75 degrees

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