Question

what is the approximate area of a circle with a diameter of 14 cm

Answer 1

154cm

Answer 2

Go to this (for more calculations)
http://www.cleavebooks.co.uk/scol/calcirc.htm

Answer 3

Medal if helped.......

Answer 4

Since they are asking for approximating, let's do without a calculator:
$$
Area=\pi r^2=\pi\left (\cfrac{d}{2}\right )^2=\pi\left (\cfrac{14}{2}\right )^2=\pi~7^2\approx 3 \times 49=147~cm^2
$$

Make sense?

Answer 5

Yea, if I were you I would do it without a calculator too :D
You will learn more, from it.