You'll see how to set up a table, choose appropriate x-values, plug those values into the equation.
Answer:
216 cm
Step-by-step explanation:
Surface area= 6a
a= 6 cm

1) In this question, we are going to make use of the formula for the area of that sector, to find the central angle.
2) So, let's write it out an expression involving the area of a circle, the unshaded area, and the shaded one and then plug into that the given data:

Thus, the centra angle of that shaded area is 72º