Answer:

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Answer:

The surface area of the cube with edges :-

⇒ (i) 7 dm is 294 dm²

⇒ (ii) 3.2 m is 61.44 m²

⇒ (iii) 2.5 cm is 37.5 cm²

Step-by-step explanation:

Given:-

The edges (side) of cubes is 7 dm , 3.2 m and 2.5 cm

To find:-

The surface area of the cubes

Solution:-

As we know that the Surface Area of cube formula is :-

➵ 6a²

∴ Surface Area of cube with 7 dm side

⇒ 6(7dm)²

⇒ 6(49) dm²

➾ 294 dm²

∴ Surface Area of cube with 3.2 m side

⇒ 6(3.2m)²

⇒ 6(10.24) m²

➾ 61.44 m²

∴ Surface Area of cube with 2.5 cm side

⇒ 6(2.5cm)²

⇒ 6(6.25) cm²

➾ 37.5 cm²

Surface area of cubes are 294dm² , 61.44m² and 37.5cm² respectively

More Information:-

Area of Square = (side)²

Surface area of cube = 6(side)²

Lateral Surface Area of cube = 4(side)²

Volume of cube = (side)(side)(side)