hello, pls help A cylinder 48 cm high has a circumference of 16 cm. A string makes exactly 4 complete turns round the cylinder while its two ends touch the cylinder's top and bottom. How long is the string in cm? thank u shahid __________________
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A cylinder 48 cm high has a circumference of 16 cm. A string makes exactly 4 complete turns round the cylinder
while its two ends touch the cylinder's top and bottom. How long is the string in cm?
ANS:
Just unfold the cylinder with the string and u ‘ll see a rectangular shaped figure where the string is present along the diagonal
One turn height: 12 cm | Circumference : 16cm
that part string length = √ (144 + 256) = 20 cm
Total lngth = 80 cm
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