Mensurationhard · Past Paper
A pen stand made of wood is in the shape of a cuboid with four conical depressions to hold pens. The dimensions of the cuboid are 15 cm by 10 cm by 3.5 cm. The radius of each of the depressions is 0.5 cm and the depth is 1.4 cm. Find the volume of wood in the entire stand.
A523.53 cm³
B525 cm³
C520 cm³
D530.4 cm³
✓ Correct Answer: A — 523.53 cm³
Vol_cuboid = 15*10*3.5 = 525. Vol_4cones = 4 * 1/3 * 22/7 * 0.5 * 0.5 * 1.4 = 1.47. Vol_wood = 525 - 1.47 = 523.53 cm³.
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