What is pi? If the area of a circle is 49π, what is its circumference? If a circle is inscribed in a square, what is the ratio of the areas of the circle and the square?

The paper fan shown was cut from a circle whose area is \(18\pi.\) What is the area of the fan?

In the square above, what is the area of the section shaded green?

What percent of the sector is shaded grey?

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