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# Properties of Circles

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?

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

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