The slant height of a cone is 12 cm and radius of the base is 4cm, find the curved surface of the cone.
Correct answer: C. 48 π cm2
- A. 74 π cm2
- B. 36 π cm2
- C. 48 π cm2
- D. 24 π cm2
Explanation
The curved surface area of a cone is πrl, where r = 4 cm and l = 12 cm. Therefore, π × 4 cm × 12 cm = 48π cm². The likely wrong choice is 36π cm², which comes from using an incorrect radius or formula.
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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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