Question

6. The radius of a circle is stated as 2:12 cm. Its area should
be written as
(a) 14 cm (b) 14:1 cm (c) 14:11 cm (d) 14:1124 cm
​

Answer 1

Answer:

14 cm

Explanation:

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Answer 2

Answer:

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Explanation:

(b) 14.1 cm2   Explanation: Area of a circle, A = πr2 On putting the values, we get: A=22/7×2.12×2.12 ⇒A=14.1 cm2

The rules to determine the number of significant digits says that in the multiplication of two or more numbers, the number of significant digits in the answer should be equal to that of the number with the minimum number of significant digits.

Here, 2.12 cm has a minimum of three significant digits.

So, the answer must be written in three significant digits.