A solid is made up of a cube and a hemisphere attached on its top . Each edge of the cube measure 5 cm and the hemisphere has a diameter of 4.2 cm. Find the total area to be painted.
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Answered by
56
Heya !!
Edge of cube = 5 cm.
Total surface area of the cube = 6 × Edge² = (6×5×5) = 150 cm².
Area to be painted = ( Total surface area of the cube ) - ( Base area of the hemisphere ) + (Curved surface area of the hemisphere).
=> ( 150 - πr² + 2πr² ) cm²
=> ( 150 + πr² ) cm²
=> ( 150 + 22/7 + 21 * 21 )
=> (150 + 693/50 ) cm².
=> ( 150 + 13.86 ) cm².
=> 163.86 cm².
Edge of cube = 5 cm.
Total surface area of the cube = 6 × Edge² = (6×5×5) = 150 cm².
Area to be painted = ( Total surface area of the cube ) - ( Base area of the hemisphere ) + (Curved surface area of the hemisphere).
=> ( 150 - πr² + 2πr² ) cm²
=> ( 150 + πr² ) cm²
=> ( 150 + 22/7 + 21 * 21 )
=> (150 + 693/50 ) cm².
=> ( 150 + 13.86 ) cm².
=> 163.86 cm².
Answered by
14
Answer:
Edge of cube = 5 cm.
Total surface area of the cube = 6 × Edge² = (6×5×5) = 150 cm².
Area to be painted = ( Total surface area of the cube ) - ( Base area of the hemisphere ) + (Curved surface area of the hemisphere).
=> ( 150 - πr² + 2πr² ) cm²
=> ( 150 + πr² ) cm²
=> ( 150 + 22/7 + 21 * 21 )
=> (150 + 693/50 ) cm²
=> ( 150 + 13.86 ) cm².
=> 163.86 cm².
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