in triangle ABC, DE ll BC. AD = 2cm, BD = 3cm, DE = 4cm. find BC. PLZ ANSWER FAST...NEED THE ANSWER URGENTLY. . ..THUMBS UP FOR SURE....

In triangle ABC,

DE IIBC (Given)

As we know that if a line drawn from any 2 sides of a triangle such that it is parallel to the third side then the third side will be half of the parallel line.

= 1/2 BC = DE

= BC = 2DC

= BC = 2* 4

= 8 cm

Hope this helps.....Happy to help

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Prove triangle ABC similar to triangle ADE (AA similarity)

Then by CPST ( corresponding parts of similar triangle ), AB/AD = BC/DE

5/2 = BC/3

BC = 15/2

BC = 7.5 cm

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thank u @shreyakse.....gud job......:)

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Yes
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shreyakse u r wrong the answer is 10 5/2=x/4 X=5*4/2 X=20/2=10 Make diagram properly
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shreyakse u r wrong the answer is 10 5/2=x/4 X=5*4/2 X=20/2=10 Make diagram properly
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n triangle ABC,

DE IIBC (Given)

As we know that if a line drawn from any 2 sides of a triangle such that it is parallel to the third side then the third side will be half of the parallel line.

= 1/2 BC = DE

= BC = 2DC

= BC = 2* 4

= 8 cm

Hope this helps.....Happy to help
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Triangle ADE is congruent to ABC Hence AD/AB= DE/BC Or 2/5=4 / BC ( AB= AD+BD) Or 2BC= 4×5 Or BC=10
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