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Question
If the total surface area of a cube is 2400 cm2 then, find its lateral surface area
Solution
T.S.A of the cube = 2400 cm2
6a2 = 2400
a2 = `2400/6`
= 400 cm2
L.S.A of the cube = 4a2 sq.units
= 4 × 400 cm2
= 1600 cm2
OR
T.S.A of the cube = 2400 cm2
6a2 = 2400
a2 = `2400/6`
= 400
a = `sqrt(400)`
= 20 cm
Side of a cube (a) = 20 cm
L.S.A of the cube = 4a2 sq.units
= 4 × 20 × 20 cm2
= 1600 cm2
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