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The figure alongside shows a parallelogram ABCD combined with a right angled triangle BCE so that ABE is a straight line and AE=29cm. side AD =15cm and DC=20cm. What is the area of quadrilateral AECD?

A. `240cm^(2)`
B. `294cm^(2)`
C. `348cm^(2)`
D.`402cm^(2)`