Answer:
Let the radius of the cylinder be r and the height be h.
Curved surface area of a cylinder = 2 π r h
Curved surface area of a cylinder = 2 π r h= 2 × 22 / 7 × 7 × 20 = 880 cm^2.
Or of an:
Acute Isosceles Triangle
Side a = 20
Side b = 20
Side c = 14
Angle ∠A = 69.513° = 69°30'46" = 1.21323 rad
Angle ∠B = 69.513° = 69°30'46" = 1.21323 rad
Angle ∠C = 40.975° = 40°58'29" = 0.71514 rad
Area = 131.14496
Perimeter p = 54
Semiperimeter s = 27
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