Total surface area of a cube having sides $l$ is given by _______.

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$6 l^{2}$

$l^{2}$

$l b + b h + h l$

$l \times b \times h$

answer is D.

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Detailed Solution

Six equal sides make up a cube.
Thus, the surface area of a cube is equal to the sum of its six sides (as shown in the figure below)

$l^{2}$ is the area of one side of a cube whose side is = ' $l$ '.
The cube's total surface area is given by $l^{2} + l^{2} + l^{2} + l^{2} + l^{2} + l^{2} = 6 l^{2}$ .

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