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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)#