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Find the area of a circle whose diameter is $8.4 cm$ .

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51.44 c m 2

55.44 c m 2

56.44 c m 2

58.44 c m 2

answer is B.

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Detailed Solution

Given a circle having diameter 8.4 cm.
The radius of circle is,

⇒ r = 8.4 2

⇒ r = 4.2 c m

Area of the circle is,

A = π r 2 ⇒ A = 227 × 4.2 × 4.2

⇒ A = 22 × 0.6 × 4.2

⇒ A = 55.44 c m 2

Therefore, the area of the circle is

55.44 c m 2

.
Hence, option 2 is correct.

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