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Asked by Pralhad Last Modified
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height of cone = 4cm ,radius of cone = 8/2 =4cm .. now volume of toy = volume of cone + volume of hemis phere .so total volume = 2/3 π r3 + 1/3 π r2 h = π r2 ( 2/3 r + 1/3 h ) = 22/7 × 4×4 (2/3 × 4 +1/3×4) = 22/7 × 16 (8/3 +4/3) = 22/7× 16 ×4 = 22/7 ×64 cube cm . Curbed surface area of cone = π r l =π 4 √ (h2 +r2 ) =π ×4 √(16+16) = π4√ 32 =22/7 × 16√2 surface area of toy =2π r2 + πrl . = 22/7 × 2× 16 + 22/7 ×16√2 =22/7 ( 32 + 16√2) = 3.14× 54.56= 171.31 cm square' answer Difference of volume of cube and toy = 83 - 22/7 × 64 = 512 - 201 = 311 cube cm answer
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