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A tape measure.
36.92 just take the circumference and divide it by pi
when you say just 7 that means a point. you can not take a circumference of jsut 7. when you take the circumference you need a circle. if your circle was radius of 7 then your circumference would be 2*pi*7 2*pi*7 = 43.96 units
Take the circumference and multiply it by it's height to get the lateral surface area.
Circumference = pi * diameter = 2 * pi * radius. If you take pi = 3.14, then circumference = 6.28 * r, so r = 15.24/6.28 = 2.427