Question

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

Answer 1

Step-by-step explanation:

2\pier=

56

891

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

7

22

r=

56

891

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

8

891

16\times 22\times r = 89116×22×r=891

352r = 891352r=891

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

32

81

so now the area of the circle is

\pie r^2\pier

2

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

7

22

×

32

81

×

32

81

\frac{72171}{3584}

3584

72171

20.13720.137

Answer 2

Answer:

area = πr²

 

πr²

=144πcm²

∴r²=  144

​r=12

circumference = 2πr

=2×π×12

=24π

radius = 12

circumference = 24π