Hey, just a quick question
do you know how to find the circumference of a circle by using the diameter
do if the diameter is 12.3cm what would it be and how would you work it out ?
thanks
The area A of a circle with radius r is $\displaystyle A = \pi{r^2}$. Since r is half of d, the formula could be written as $\displaystyle A = \pi{(0.5d)^2} = 0.25\pi{d^2}$.
right so just let me check to see if this is right, if it is im sorted
the question was find the area of a circle using diameter=14.8cm
so i do 14.8 divided by 2=7.4 then pie x 7.4squared=172.3
is this right?