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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?

In the above diagram, \(d_1=24\) and \(d_2=18.\) What is the perimeter of the green colored region?

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In the above image, \( \angle ABC = 115 ^ \circ \). What is angle \( AOC \) (as marked) equal to?

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The length of each side in the above square is \(14.\) If the two curves in the square are each one quarter of a circle with radius \(14,\) calculate the area of the region bounded by the two curves in the above diagram.

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Let \(O_1\) and \(O_2\) be the centers of two circles with the same radius \(15\text{ cm}.\) What is the perimeter of the green colored region?

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