D.
The area of a circle is given by:
[tex]A=\pi r^2[/tex]Since the diameter is 6 cms this means that the radius is 3 cm (remember that the radius is half the diameter).
Then:
[tex]A=\pi(3)^2=9\pi[/tex]Therefore the exact area of the circle is 9pi squared centimeters.
E.
To find the approximate area we plug 3.14 instead of pi in the last expression, then:
[tex]A=3.14\cdot9=28.26[/tex]Therefore the approximate area of the circle is 28.26 squared centimeters.
