In `DeltaABC`, seg `DE||` side `BC`. If `2Ar(DeltaADE)=Ar(squareDBCE)`, find `AB:AD` and show `BC=sqrt(3)xxDE`.

In DeltaABC, DEabs()BC . If AD= 2.4 cm, AE= 3.2 cm, DE= 2 cm and BC= 5 cm, find BD and CE.

In DeltaABC , seg AD bot seg BC , DB=3CD . Prove that 2AB^(2)=2AC^(2)+BC^(2) .

In Delta ABC seg AD perp seg BC,DB=3CD Prove that 2AB^(2)=2AC^(2)+BC^(2)

In the figure A-D-C and B-E-C seg DE|| side AB. If AD=5, DC=3, BC=6.4 then find BE.

In DeltaABC , ray BD bisects /_ABC . A-D-C , side DE|| side BC , A-E-B . Prove that, (AB)/(BC)=(AE)/(EB) . Complete the activity by filling the boxes. In DeltaABC , ray BD is the bisector of /_ABC :.(AB)/(BC)=square ....... (I) (By angle bisector theorem) In DeltaABC , seg DE|| side BC :.(AE)/(EB)=(AD)/(DC) ........ (II) square :.(AB)/(square)=(square)/(EB) .......[From (I) and (II) ]

In DeltaABC, D is any point on side BC. Prove that AB+BC+CA gt 2AD

Delta ABC ~ Delta PQR and ar(DeltaABC)=4ar(DeltaPQR) IF BC=12cm then find QR