a cubiod box of length 21 cm ,breadth 14 cm and height 7 cm is made up of cardboard . from the top face,two circles of diameter 7 cm and one rectangle of length 3 cm and breadth 1 cm is cut . what is the total surface area of remaining box
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Answer: 998cm²
TSA of remaining box = SA of box - (Area of 2 circles + Area of rectangle)
TSA = 2(lb+bh+hl)-(2 x πr² + lb)
= 2(21 x 14 + 14 x 7 + 7 x 21) - ( 2 x 22/7 x 3.5 x3.5 + 3 x 1)
= 998cm²
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