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In a frame of lampshade, it …

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In a frame of lampshade, it is to be covered with a decorative cloth. The frame has a base diameter of 20 cm and height of 30 cm. A margin of 2 cm is to be given for folding it over the top and bottom of the frame. Find how much cloth is required for covering the lampshade

    • Posted by Pradeep Jain 8 years, 9 months ago

    CBSE > Class 09 > Mathematics
    • 1 answers

    Shweta Gulati 8 years, 9 months ago


    Radius of the frame (r) = 20/2 cm = 10 cm
    Height of the frame (h) = 30 cm + 2×2.5 cm = 35 cm
    2.5 cm of margin will be added both side in the height.
    Cloth required for covering the lampshade = curved surface area = 2πrh
                                                      = (2 × 22/7 × 10 × 35)cm2
                                                      = 2200 cm2

     

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