Answer :

Given:

Dimensions of block = 15 cm × 10 cm × 3.5 cm


Radius = 0.5 cm


Depth = 2.1 cm


Volume of wood left in pen stand = Volume of the block – Volume of 4 cones …(1)


Volume of the block = 15 cm × 10 cm × 3.5 cm


Volume of the block = 525 cm3


Volume of 4 cones = 4 × Volume of 1 cone





Volume of 4 cones = 4 × (22 × 0.5 × 0.5×0.1)


Volume of 4 cones = 4 × 0.55


Volume of 4 cones = 2.2 cm3


Putting them in (1),


Volume of wood left in pen stand = 525 cm3 – 2.2 cm3


Volume of wood left in pen stand = 522.8 cm3


Hence, Volume of wood left in pen stand = 522.8 cm3


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