Q.

The radius of a disc is 1.2cm. Its area according to the idea of significant figures is

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a

4.5216 cm2

b

4.521 cm2

c

4.52 cm2

d

4.5 cm2

answer is D.

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Detailed Solution

A=πR2;R=1.2 A=(3.14)(1.2)2=4.5216=4.5 cm2
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The radius of a disc is 1.2cm. Its area according to the idea of significant figures is