Question

Calculate the surface areas of the cubes with edges :
(i) 7 dm
(ii) 3.2 m
(iii) 2.5 cm.​

Answer 1

Answer:

A cube is a solid box whose every surface is a square of same area.

Take an empty box with open top in the shape of a cube whose each edge is 2 cm. Now fit cubes of edges 1 cm in it. From the figure it is clear that 8 such cubes will fit in it. So the volume of the box will be equal to the volume of 8 unit cubes together.

Therefore, the volume of the cube = 8 cu cm

Note that 8 = 2 × 2 × 2

Thus, volume of a cube = side × side × side = side3

Step-by-step explanation:

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Answer 2

Answer:

(

Step-by-step explanation:

(i)7dm =294dm²

(ii)3.2m=61.44m²

(iii)2.5cm=37.5cm²