40√3+432/7 is the answer
Hope this helps :D
a. irrational numbers
This is because irrational numbers are number like pi and non perfect square roots, etc
The diameter of a circle is calculated by using the formula D=r2pi so plug in the known values to find r=2/pi. Next plug r into the area of a circle formula(A=r^2pi) do so and get 4/pi