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The radius of a cylindrical vessel is 7cm and height is 3cm. Find the whole surface of the cylinder?

Correct answer: C. 440 sq cm

  • A. 308 sq cm
  • B. 220 sq cm
  • C. 440 sq cm
  • D. 132 sq cm

Explanation

The whole surface area of a closed cylinder is 2πr(h + r). Substituting r = 7 cm and h = 3 cm gives 2π × 7 cm × 10 cm = 140π cm² = 440 cm² using π = 22/7. The likely wrong choice is 308 cm², which corresponds to using an incorrect combination of radius and height.

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About Area and Volume

Area measures the surface enclosed by two-dimensional figures, while volume measures the space occupied by three-dimensional solids. Problems use formulas for rectangles, triangles, circles, prisms, cylinders, cones, spheres, and composite figures, including unit conversion and the distinction between surface area, lateral area, and volume.

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