Radius:
From the figure we notice that the radius is 3 units.
Diameter:
The diameter is twice the radiues, hence the diameter is 6 units.
Circumference:
The circumference is given by:
[tex]C=\pi D[/tex]
where D is the diamteter, therefore the circumference is:
[tex]C=6\pi[/tex]
Area:
The area is given by:
[tex]A=\pi r^2[/tex]
where r is the radius, plugging the values we have:
[tex]A=\pi(3)^2=9\pi[/tex]
therefore the area is:
[tex]A=9\pi[/tex]
