Question

1. Find the total surface area of cubes having the following sides.
(i) 3 cm (i) 5 cm (iii) 7.2 m (iv) 6.8 m (v) 5.5 m​

Answer 1

Answer:

54 cm²

150 cm²

311.04 cm²

277.44 cm²

181.5 cm²

TSA of Cube = 6*(side)²

Answer 2

Solution

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Formula used:-

• TSA of a cube = 6a²

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(i) Side = 3cm

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→ TSA = 6 × (3)²

→ TSA = 6 × 9

→ TSA = 54cm²

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(ii) Side = 5cm

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→ TSA = 6 × (5)²

→ TSA = 6 × 25

→ TSA = 150cm²

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(iii) Side = 7.2m

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→ TSA = 6 × (7.2)²

→ TSA = 6 × 51.84

→ TSA = 311.04m²

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(iv) Side = 6.8m

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→ TSA = 6 × (6.8)²

→ TSA = 6 × 46.24

→ TSA = 277.44m²

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(v) Side = 5.5m

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→ TSA = 6 × (5.5)²

→ TSA = 6 × 30.25

→ TSA = 181.5m²

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Hence,

• TSA of (i) = 54cm²
• TSA of (ii) = 150cm²
• TSA of (iii) = 311.04m²
• TSA of (iv) = 277.44m²
• TSA of (v) = 181.5m²