Question

IN Triangle ABC
it is given that DE||BC.IF AD=3CM,DB =2CM AND DE IS 6CM .FIND BC?

Answer 1

Given: ABC is a triangle , DE parallel BC and AD= 3 cm, DB=2 cm and DE=6 cm

To find:  AE

sol:  Since DE parallel BC

     angle ADE= angle ABC (corresponding angles)

and angle AED = angle ACB  (                "               )

Triangle ADE ≈ triangle ABC ( by AA similarity)

therefore ,  AD/AB=DE/BC=AE/AC          (1)

From (1)

AD/AB=AE/AC

2/5=x/18

2×18=5x

36=5x

x=36/5

x=7.5cm

∵ AE = 7.5 cm

Answer 2

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Here's ur answer........pls mark as brainliest