Question

Circumference =66 cm ,Area=?

Answer 1

2×3.14×r=66
r=66/2×3.14
r=33/3.14
r=10.5cm(approx.)


3.14×r^2
=3.14×10.5×10.5
=346.18cm^2

Answer 2

Circumference of circle = 2πr
= 2πr = 66
= 2×22/7×r = 66
= r = 66×7/2×22
= r = 462/44
= r = 10.5cm
Area of circle = πr^2
= 22/7×10.5×10.5
= 22/7×105/10×105/10
= 22×105×105/7×10×10
= 242550/700
= 346.5cm^2....

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