Circumference: Finding Area based off Perimeter and Vice Versa

A circle has a circumference of 6.28.

What is its area?

π

A circle has a circumference of

$10\pi$ cm. What is its area?

$25\pi$ cm²

A circle has a circumference of

$3\pi x$ cm.

What is its area?

$2.25\pi x^2$ cm²

A circle has an area of $36\pi$.
What is the circumference?

$12\pi$ cm

Since the circumference is equal to$20\pi$

What is your area?

$100\pi$

Since the circumference is equal to$26\pi$

What is your area?

$169\pi$

Since the circumference is equal to$30\pi$

What is your area?

$225\pi$

Since the circumference is equal to$34\pi$

What is your area?

$289\pi$

Since the circumference is equal to$4\pi$

What is your area?

$4\pi$

Since the circumference is equal to$5\pi$

What is your area?

$6\frac{1}{4}\pi$

Since the circumference is equal to$6\pi$

What is your area?

$9\pi$

The circle below has a circumference of $8\pi a$ cm.

What is the area of the circle?

$16\pi a^2$ cm

The circumference of a circle is equal to 20. What is the area of the circle?

31.831

The circumference of a circle is equal to 6.

What is its area?

$\frac{9}{\pi}$

The circumference of a circle is equal to $31\frac{1}{9}$.

Calculate its area.

77

The circumference of a circle is $8\pi$.

Calculate its area.

50.2

What is the area of a circle given that its circumference is equal to 10?

$\frac{25}{\pi}$

What is the area of a circle given that its circumference is equal to 4?

$\frac{4}{\pi}$

A circle has an area of $81a^2\pi$.

What is its circumference?

$18a\pi$ cm

A circle has an area of $\frac{\pi x^2}{4}$ cm².

What is its perimeter?

$\pi x$ cm