Story problem

[marlinda6]

Question:
A circular dartboard has 12 regions of equal area where points can be scored. The total area of its outer border is 5 in2. If the total area of the board is 144in2, what is the area of each point-scoring region?

 

[stapel]

Subtract the "outer" area from the "total" area. Divide the remaining "scoring" area by the number of regions.

Eliz.