- 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.
By substituting values in first equation,
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.