The area of a circle is: pi times radius squared
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Area of the circle: pi*11^2 = 121*pi square units
Area of the circle: pi*11^2 = 121*pi square units
Entire surface area: (2*pi*121)+(22*pi*23) = = 748*pi square inches
There are two ends, each of area {pi}r2 and the side which can be worked out by cutting the cylinder down (from end to end) and unrolling; one length is the cylinder height (h), the other is the circumference of the end (2{pi}r), giving 2{pi}rh. Area = 2x({pi}r2) + 2{pi}rh Area ~= 2x3.14x112 + 2x3.14x11x11 Area ~= 1520.5in2
The radius a circle with area of π*121 yd2 is 11 yds [= sqrt(121)] The circumference, therefore, is 2*11*π = 22*π yards.