In the diagram, AR=4 cm, QA = 3 cm, DQ = 7 cm and PD = 4 cm. Find (a) the length of AB; (b) the length of BC; (c) the ratio of the areas of triangle ARB and ABRC; (d) the ratio of the areas of triangle BRC and triangle PRD.
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a. 4cm
b. 16/7 cm
c. 7:11
d. 16:49
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