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The circumference of a trunk of tree is cylindrical in shape is 132 cm sq .find the volume of timber that can be obtained from the trunk if the length of

the trunk is 1.5 m
circumference = 132 cm sq....how...?? cm sq is wrong



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As unit of circumference can't be squared, so considering circumference = 132 cm .
now, circumference = 2π r = 132
                                 ⇒ r= 66/π
                                 ⇒r = 21 cm
length of trunk, h = 1.5 m = 1.5 ×100 = 150 cm
volume of timber = π r² h
                            = (22/7) ×(21)²×150
                            =207900 cm³
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