1.

If In the figure ABCD is a rectangle inscribed in a quadrant of a circle of radius 10 cm. If \[AD=2\sqrt{5}\,cm,\]find the area of the rectangle.

A. \[30\,c{{m}^{2}}\]     
B.   \[50\,c{{m}^{2}}\]     
C.   \[~40\text{ }c{{m}^{2}}\]    
D.   \[~35\text{ }c{{m}^{2}}\]
Answer» D.   \[~35\text{ }c{{m}^{2}}\]


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