Question

If the outer diameter of a iron ring is 70 cm and the ring is 5 cm wide,
calculate how much square is iron sheet in the Ring.

Answer 1

answer:

75 cm square is iron sheet in the ring

Answer 2

Solution :-

→ Outer diameter = 70 cm

So,

→ Outer radius = 70/2 = 35 cm .

then,

→ Inner radius = 35 - 5 = 30 cm .

therefore,

→ Area of iron sheet = Outer ring area - Inner ring area

→ Area of iron sheet = π[35² - 30²]

→ Area of iron sheet = 3.14 * (35 + 30) * (35 - 30)

→ Area of iron sheet = 3.14 * 65 * 5

→ Area of iron sheet = 1020.5 cm² (Ans.)

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