Area of a circle

The formula to find the area of a circle is $$A = \pi r^2$$ , where A is the area and r is the radius.

The symbol $$\pi$$ represents the ratio of the circumference of a circle to its diameter, approximately equal to 3.14.

The area is $$A = \pi (10)^2 = 100\pi \approx 314.16 cm^2$$ .

The diameter is twice the length of the radius. Formula: $$d = 2r$$ .

The radius is 15 meters, since $$r = \frac{d}{2} = \frac{30}{2}$$ .

The approximate value of $$\pi$$ is 3.14.

The circumference can be calculated using the formula $$C = 2\pi r$$ .

The circumference is $$C = 2\pi(5) = 10\pi \approx 31.42 inches$$ .

The area is $$A = \pi(7)^2 = 49\pi \approx 153.86 cm^2$$ .

The diameter is 24 feet, since $$d = 2r = 2(12)$$ .