Question

18.
If AABC – ADEF, BC = 4 cm, EF = 5
cm and Ar(AABC) = 80 cm2 the
Ar(ADEF).​

Answer 1

80 * 5 = 4x [ Using proportionality 4:5::80:x ]
4x = 400
x = 100
Area of triangle DEF is 100 cm^2