- Consider a circle of radius 10 cm and circumference of 62.8cm.

- Substitute the values in any of the two equations, A= (Cd)/4 or A= pie * square of radius.

**NOTE:**Here, A is the area of circle, C is the circumference of the circle, d is the diameter of the circle and pie= 22/7.

**By substituting values in first equation,**

**A= (62.8*2*10)/4.**

Thus Area of the circle of radius 10 cm and circumference of 62.8 cm is 314 sq.cm.

**By substituting values in second equation,**

**A= pie * sq.radius.**

A= (22/7) * 100. Thus area of circle is 314 sq.cm.

Thus you can find the area of a circle if the diameter and circumference or radius is known.

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