Question

answer this maths legends please

Answer 1

Answer:

(i) 968 cm²

(ii) 1064.8 cm²

(iii) 2038. 08 cm²

Step-by-step explanation:

Given,h = 77 cm.

(a)

Given, inner diameter = 4 cm.

Then, radius r₁ = 2 cm.

(b)

Given, outer diameter = 4.4 cm.

Then, radius r₂ = 2.2 cm

(i)

Inner curved surface area = 2πr₁h

= 2 * (22/7) * 2 * 77

= 968 cm².

(ii)

Outer curved surface area = 2πr₂h

= 2 * (22/7) * 2.2 * 77

= 1064.8 cm²

(iii)

Total surface area = 2πr₂h + 2πr₁h + 2π(r₂² - r₁²)

= 1064.8 + 968 + 2 * 22/7 * (4.84 - 4)

= 1064.8 + 968 + 2 * 22/7 * 0.84

= 1064.8 + 968 + 5.28

= 2038.08 cm²

Hope it helps!