Required
9. Find the height of candle
whose radius is 7mm and the
total suface area is 2772
sq.mm.
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total surface are of cylinder=2×22/7rh+2×22/7r2
2772 =44/7×7h+44/7×49
2772 =44height+44×7
2772 =44height+308
2772-308/44 =height
56mm =height
height of candle is 56mm
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