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?

A circular sector with a radius of 10 has an area of 200. What is the central angle (in radians)?

A circular sector with central angle 5 radians has an area of 250. What is its radius?

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