Question

Find the circumference of a circle whose area is 891/56 m2

Answer 1

Step-by-step explanation:

Given that pi r square =891/56

r square =891×7/22×56

r square =81/16

r=9/4

circumference =2×22/7×9/4

= 99/7

14.14 m

Answer 2

$2\pie r = \frac{891}{56}$

$2 \frac{22}{7} r = \frac{891}{56}$

$2 \times 22 \times r = \frac{891}{8}$

$16\times 22\times r = 891$

$352r = 891$

$r = \frac{81}{32}$

so now the area of the circle is

$\pie r^2$

$\frac{22}{7} \times \frac{81}{32} \times \frac{81}{32}$

$\frac{72171}{3584}$

$20.137$