Answer:
113.1cm^2
Step-by-step explanation:
We know the area for a circle is pi * r^2, where r is the radius. We know the diameter, so all we need to do to find the radius is half the distance of the diameter, which would then be 6 cm. We plug in 6 as r, we get 36pi cm^2 as our exact answer. And a good approximation would be 113.1 cm^2.
Answer: 37.68
Step-by-step explanation:
First off our formulas are:
[tex]Area: A=\pi r^2\\Circumference: C=2\pi r[/tex]
Solve for r in the area formula.
[tex]A=\pi r^2\\r^2=\frac{A}{\pi} \\r=\sqrt[]{\frac{A}{\pi} }[/tex]
[tex]r=\sqrt[]{\frac{36\pi}{\pi} }[/tex]
[tex]r=\sqrt[]{36}[/tex]
r=6
Plug this into the circumference formula.
[tex]C=2\pi r\\C=2(3.14)(6)\\C=37.68[/tex]
