Answer:
117.8097
Explanation:
Depending on how you're math is going there are two ways to solve this, find the are by the arc or just figure out the whole cookie and divide by 6. Let's try the latter is seems easier to say. I mean easier for me to say.
area of a circle is pi * r^2
the diameter is 30 inches so the radius is half of that or 15 inches
then the whole cookie is
pi*15^2 = 706.858
now divide by 6 or each piece
706.858
/ 6 = 117.8097
now eat your cookie :p