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radius of circular base of an ear of corn is 6.6cm and its length is 11.2cm. If on average 1cmsq area contains 2 corns kernels, then what is the total number of kernels on a corn |
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Answer» Curved surface area of corn = πrlNow, l = √( r² + h² )= √( 6.6² + 11.2² )= √( 43.56 + 125.44 )= √169 = 13 cmSo, curved surface area = 22/7 × 6.6 × 13 cm²= 269.7 cm²Now, when 1 cm² covers = 2 kernels Then 269.7 cm² will cover = 269.7 × 2 = 539.4 kernels Hence, 539 kernels ( approx. ) will be in the corn. |
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