In a right-angled triangle ABC, right angled at B, point D and E are on AB and BC such that DE||AC. If AD = 3 cm and EC = 4 cm. and area of quadrilateral ADEC is 42cm sq. find the area of ∆DBE. (in sq. cm)
a) 54
b) 36
c) 72
d) 64
Sol:
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