The edges of cuboid are 4 cm; 5 cm and 6 cm. Find its surface area?
Correct answer: B. 148 cm2
- A. 120 cm2
- B. 148 cm2
- C. 74 cm2
- D. 15 cm2
Explanation
The surface area of a cuboid is 2(lw + lh + wh), so 2[(4 cm x 5 cm) + (4 cm x 6 cm) + (5 cm x 6 cm)] = 2(20 + 24 + 30) cm2 = 148 cm2. Students may choose 120 cm2 by multiplying the three edges, which finds volume rather than surface area.
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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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