R and S are points on the sides DE and EF respectively fo a `triangle DEF ` such that ER = 5 cm, ` RD = 2.5 cm, SE = 1.5 cm " and " FS = 3.5 cm.` Find Whether ` RS |\| DF` or not.

R and s are points on the sides DE and EF respectively of a DeltaDEF such that ER = 5 cm , RD = 2.5 cm , SE = 1.5 cm and FS = 3.5 cm .Find whether RS"||"DF or not .

L and M are points on the sides DE and DF respectively of a MJEF. State whether LM II EF or not. DE = 8 cm, DF = 15 cm, LE = 3.2 cm and MF= 6 cm.

P and Q are the points on the sides DE and DF of a triangle DEF such that DP = 5 cm, DE = 15 cm, DQ = 6 cm and QF = 18 cm. Is PQ||EF? Give reasons for your answer

triangle ABC - triangle DEF such that DE = 3 cm, EF = 2 cm, DF = 2.5 cm " and " BC = 4 cm. Find perimeter of triangle ABC .

M and N are points on sides AC and BC respectively of a triangleABC . State whether MN||BC if CM = 4.2 cm, MA= 2.8 cm , NB = 3.6 cm, CN = 5.7 cm.

D and E are respectively the points on the sides AB and AC of a triangle ABC such that AE = 5 cm, AC= 7.5 cm, DE= 4.2 cm and DEabs() BC . Then find length of BC.

DeltaABC ~ Delta DEF such that DE = 3 cm , EF = 2 cm , DF = 2.5 and BC = 4 cm . Find the perimeter of DeltaABC.

D and E are points on the sides AB and AC respectively of a triangle ABC such that DE||BC (i) If AD=3.6cm , AB=10cm and AE=4.5cm, find EC and AC . (ii) If AB=13.3cm , AC=11.9cm and EC=5.1cm, " find AD (iii) If (AD)/(DB)=(4)/(7) and AC=6.6cm find AE (iv) If (AD)/(AB)=(8)/(15) and EC=3.5cm find AE

D and E are respectively the points on the sides AB and AC of a triangle ABC such that AD = 2 cm , BD = 3 cm , BC = 7.5 cm and DE || BC. Then length of DE (in cm) is (a) 2.5 (b) 3 (c) 5 (d) 6