You want to buy some rice. An 8-ounce package costs $2.72. A 12-ounce package costs $4.32. A
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The highlighted sector is exactly 3/4 of the circle area, because is 3/4 of
which is a complete rotation.
Since you are given the radius, you can compute the area as
So, 3/4 of this area would be squared cm.
The remaining sector, of course, is squared cm.