total surface area?
40π cm² / 5 cm = 8π cm for the circumference
8π / π = 8cm for the diameter
or 4 cm for the radius.
Area of the ends is 2 x πr² = 32π
area of the lateral area is 40π
sum is 72π
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40π cm² / 5 cm = 8π cm for the circumference
8π / π = 8cm for the diameter
or 4 cm for the radius.
Area of the ends is 2 x πr² = 32π
area of the lateral area is 40π
sum is 72π