Question

If triangle ABC is similar to triangle Def, BC is equals to 4 centimetreglamour f is equals to 5 centimetres and area of triangle ABC is equals to 80 CM then area of triangle d e f is equals to

Answer 1

ΔABC ≈ Δ DEF
BC = 4 cm 
DF = 5 CM
ar (ΔABC)/  ar(ΔDEF) = BC²/DF²
80/ar(ΔDEF) = 4×4/5×5
80×25/16 = ar(ΔDEF)
5×25 = ar(ΔDEF)
∴ar(ΔDEF) = 125 cm² ANS