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In the figure below, a circle is inscrib...

In the figure below, a circle is inscribed inside a square. In the gap between the circle and the square (at the corner) a rectangle measuring 20 cm. `xx` 10 cm. is drawn such that the corner A of the rectangle is also a point on the circumference of the circle. What is the radius of the circle in cm?

A

30 cm

B

40 cm

C

50 cm

D

60 cm

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