Question

7. The Circumference of a Circle is12.56 cm, find its radius and area.
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Answer 1

radius of this circle = 12.56/2= 6.28

and to find the area of this circle use this formula = 3.14*r²

= 3.14*6.28

= 19.71

so radius = 6.28

and area = 19.71 cm

Answer 2

The Circumference of a Circle is 12.56 cm, find its radius and area.

Circumference = 12.56 cm

$\mathtt{area = \pi \: {r}^{2} } \\ \\ \mathtt{ {r}^{2} = \frac{12.56}{\pi} } \\ \\ \mathtt{ {r}^{2} = \frac{12.56}{3.14} } \\ \\ \mathtt{r = \sqrt{ \frac{12.56}{3.14} } } \\ \\ \mathtt{r = 1.99}$

Now,

$\mathtt{circumfrence = 2\pi \: r} \\ \\ \mathtt{circumfrence = 2\pi \: 1.99} \\ \\ \mathtt{\implies12.56 \: cm \: ans}$