Question

the total surface area of a cube is 726 cm². find the length of its edge

Answer 1

TSA = 6asquare
726 ÷ 6 = a square
121 = a square
then a = root 121
a = 11

then ans is 11



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Answer 2

Hey friend, Harish here.

Here is your answer:

Given that,

T.S.A of cube = 726 cm²

To find,

The length of its edge.

Solution:

We know that,

$T.S.A\ of\ Cube = 6a^{2}$

Here a is the side length of the cube or the edge of the cube.

⇒ $726 = 6 \times a^{2}$

⇒ $a^{2} = \frac{726}{6}= 121$

⇒ $a = \sqrt{121} = 11\ cm$

Therefore the edge of the cube is 11 cm.
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Hope my answer is helpful to you.