If the area of circle is 78.5cm, find its circumference(Take pi- 3.14)
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πr^2=78.5
3.14r^2=78.5
r^2=78.5÷3.14=25
r^2=25
r=5cm
P=2πr
P=2×3.14×5
P=31.4cm
3.14r^2=78.5
r^2=78.5÷3.14=25
r^2=25
r=5cm
P=2πr
P=2×3.14×5
P=31.4cm
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