हिंदी

In the Given Figure, If ∠Ade = ∠B, Show that δAde ~ δAbc. If Ad = 3.8cm, Ae = 3.6cm, Be = 2.1cm and Bc = 4.2cm, Find De. - Mathematics

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प्रश्न

In the given figure, if ∠ADE = ∠B, show that ΔADE ~ ΔABC. If AD = 3.8cm, AE = 3.6cm, BE = 2.1cm and BC = 4.2cm, find DE.  

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उत्तर

Given :
∠𝐴𝐷𝐸= ∠𝐴𝐵𝐶 𝑎𝑛𝑑 ∠𝐴= ∠𝐴
Let DE be X cm 
Therefore, by AA similarity theorem, Δ ADE - Δ ABC  

⇒ `(AD)/(AB)=(DE)/(BC)` 

⇒ `3.8/(3.6+2.1)=x/4.2` 

⇒` x=(3.8xx4.2)/5.7=2.8` 

Hence, DE = 2.8 cm    

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अध्याय 4: Triangles - Exercises 2

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आर.एस. अग्रवाल Mathematics [English] Class 10
अध्याय 4 Triangles
Exercises 2 | Q 4
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