Area and Circumference of a Circles

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

The circumference of a circle is calculated using the formula $$C = \pi d$$ or $$C = 2 \pi r$$ , where C is the circumference, d is the diameter, and r is the radius.

The radius is 12, calculated using the formula $$C = 2 \pi r$$ .

The diameter is twice the radius, expressed as $$d = 2r$$ .

You can find the diameter using the formula $$d = \frac{C}{\pi}$$ .

The area is $$A = \pi (6^2) = 36\pi$$ .

The circumference is $$C = 2 \pi (8) = 16\pi$$ .

The area is $$A = \pi (\frac{10}{2})^2 = 25\pi$$ .

The circumference is $$C = \pi (60) = 60\pi$$ .

The area is $$A = 81\pi$$ , calculated from the radius derived from the circumference.