Find the total surface area, lateral surface area and the length of the diagonal of a cube whose edge is 4.5 cm.
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(1) total surface area of cube
= 6l²= 6(4.5)²= 6×20.25= 121.5cm²
(2) lateral surface area
= 4l²= 4(4.5)²= 4(20.25)= 81cm²
(3) length of diagonal
= √3l= (1.73)(4.5)= 7.79 cm
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