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

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: