आकृत (i) और (ii) में, $DE parallel to BC$ है। (i) में EC और (ii) में AD ज्ञात कीजिए:

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Solution

(i) ∆ABC में,

DE parallel to BC

[ दिया है ]

rightwards double arrow space space space AD over DB space equals space AE over EC

rightwards double arrow space space space space fraction numerator 1.5 over denominator 3 end fraction space equals space 1 over EC rightwards double arrow space space space space EC space space equals space fraction numerator 3 over denominator 1.5 space end fraction space equals space 2 space cm

(ii) ∆ABC में,

DE parallel to BC

[ दिया है ]

rightwards double arrow

AD over DB space equals space AE over EC

rightwards double arrow space space space space fraction numerator AD over denominator 7.2 end fraction space equals space fraction numerator 1.8 over denominator 5.4 end fraction rightwards double arrow space space space space space AD space equals space fraction numerator 7.2 cross times 1.8 over denominator 5.4 end fraction space equals space 2.4 space cm

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