The area of a circle is the plane region bounded by the circles circumference. A p 4 D2. The surface area of circle is 4pr 2.
If each square in the circle to the left has an area of 1 cm 2 you could count the total number of squares to get the area of this circle.
Circumference of a Circle. The approximate value of pi is 314. It can be found using the formula A pr 2 where r is the circles radius. If each square in the circle to the left has an area of 1 cm 2 you could count the total number of squares to get the area of this circle.