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ollegr [7]
2 years ago
7

A cube has a surface are of 54. What's the volume?

Mathematics
2 answers:
gladu [14]2 years ago
8 0
<h3><u>Given Information :</u></h3>

  • Surface area of cube = 54 sq. units

<h3><u>To find :</u></h3>

  • Volume

<h3><u>Calculation :</u></h3>

We know that,

\bigstar \: \boxed{\sf {Volume_{(Cube)} = (\ell)^3}} \\

  • l = length of side

Let's find out the side first. We know that,

\bigstar \: \boxed{\sf {T.S.A_{(Cube)} = 6\ell^2}} \\

According to the question,

\longmapsto \sf {54 = 6\ell^2 }

\longmapsto \sf {\dfrac{54}{6} = \ell^2 }

\longmapsto \sf {9 = \ell^2 }

\longmapsto \sf {\sqrt{9} = \ell }

\longmapsto \sf \red{3 \: units = \ell }

Now, calculating volume :

\bigstar \: \boxed{\sf {Volume_{(Cube)} = (\ell)^3}} \\

→ Volume = l × l × l

→ Volume = 3 × 3 × 3

→ <u>Volume = 27</u>

<h3><u>Option B</u> is correct.</h3>

bixtya [17]2 years ago
6 0

Answer:

B

Step-by-step explanation:

54/6=9 meaning each face has an area of 9.

Meaning each side has an area of 3.

That means the volume is 3*3*3=27

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