Square Area and Circle Area. How Do You Find the Area of a Circle if You Know the Radius. In this tutorial youll learn the formulas for the circumference of a circle.
In this equation C represents the circumference of the circle and d represents its diameter.
C 2pr Therefore here we can find the value of radius r C2p Once we have evaluated the value of radius we can easily find the area. Learn the formula for circumference. A p 4 D2. The area of a circle is.