Question

The edge of a cube is a / 2 cm
then surface area is
3a/2
3a2/2
6a2
3a2​

Answer 1

Given :

• The edge of a cube = a/2 cm

To find :

• surface area of the cube

Formula used :

$\underline{\boxed{\bf{ surface \: area \: of \: cube \: = 6{(side)}^{2} }}}$

Solution :

edge of a cube = a/2 cm

Now we will find surface area :-

$\implies{\bf{ surface \: area = 6{(side)}^{2} }}$

$\implies{\bf{ surface \: area = 6{( \dfrac{a}{2}) }^{2} }}$

$\implies{\bf{ surface \: area = 6 \times {\dfrac{ {a}^{2} }{4} } }}$

$\implies{\bf{ surface \: area = 3 \times {\dfrac{ {a}^{2} }{2} } }}$

$\implies{\bf{ surface \: area = {\dfrac{ 3{a}^{2} }{2} } }}$

Answer :- 3a²/2

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Learn more :

Volume of cylinder = πr²h

T.S.A of cylinder = 2πrh + 2πr²

Volume of cone = ⅓ πr²h

C.S.A of cone = πrl

T.S.A of cone = πrl + πr²

Volume of cuboid = l × b × h

C.S.A of cuboid = 2(l + b)h

T.S.A of cuboid = 2(lb + bh + lh)

C.S.A of cube = 4a²

T.S.A of cube = 6a²

Volume of cube = a³

Volume of sphere = (4/3)πr³

Surface area of sphere = 4πr²

Volume of hemisphere = ⅔ πr³

C.S.A of hemisphere = 2πr²

T.S.A of hemisphere = 3πr²