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1). 25.6%2). 65.8%3). 45.2%4). 50.4%

Answer»

VOLUME of Hemisphere = (2/3) × π × r3, where r is the radius of hemisphere.

In case of 1st hemisphere,

Inner radius = 3 cm

∴ Volume of water in it = (2/3) × π × 33 = 18π SQ. cm.

In 2nd hemisphere,

Inner radius = 6 cm.

∴ Volume of water it can contain = (2/3) × π × 63 = 144π sq. cm.

∴ Empty volume = 144π - 18π = 126π sq. cm.

∴ Percentage empty = (126π/144π) × 100 = 87.5%



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