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Mathematics 7 Online
OpenStudy (anonymous):

In the diagram, ABCD is an isosceles trapezoid. Its bases are  and .   is extended to E, and  and  are perpendicular. Side  is a diameter of semicircle O, AB = 4, AE = 3, DE = 4, and DC = 10. (a)  The length of  is units. (b)  The area of the entire figure to the nearest integer is square units.

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