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Question 81

Find the area of the shaded portion in the following figures.


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Solution


Area of shaded portion=Area of trapezium-Area of rectangle-Area of circle
Area of trapezium==12×[Sum of parallel sides]×Height =12×(120+160)×100 =12×280×100 =280002=14000cm2Area of rextangle=Length×Breadth=40×20=800cm2Area of circle=πr2=227×7×7 =154cm2Area of shaded portion=14000800154 =13046cm2


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