Question

19. In the figure, if DE || BC, then the value of x is :
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Answer 1

Answer:

I hope it will help you.

Step-by-step explanation:

According to BPT(Basic Proportionality Theorem):-

In two similar triangle ratio of their corresponding sides are proportional.

In triangle ADE and ABC

<ADE=<ABC (alternate Interior Angle)

<AED=<ACB (alternate Interior Angle)

So,

triangleADE ~ triangleABC

AD/AB = DE/BC (by BPT)

2/5 = 4/x

x= 5*4 /2

x= 10cm