नीचे दी गयी आकृति में, ∠AED = ∠BAC, AD || BC, AD : BC = 7 : 9 और AC = 36 सेमी है, तो EC की लंबाई ज्ञात कीजिए।

  1. 10 सेमी
  2. 12 सेमी
  3. 8 सेमी
  4. 16 सेमी

Answer (Detailed Solution Below)

Option 3 : 8 सेमी
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दिया गया है:

∠AED = ∠BAC

AD || BC

AD : BC = 7 : 9

AC = 36 सेमी

अवधारणा:

त्रिभुज की समरूपता

गणना:

चूँकि ∠AED = ∠BAC 

∠EAD = ∠ACB (वैकल्पिक आंतरिक कोण)

समरूपता का नियम AA (कोण-कोण)

∆EDA और ∆ABC  समरूप हैं।

अब,

AD/BC = AE/AC

⇒ 7/9 = AE/36

⇒ AE = 28 सेमी

अब,

EC = AC – AE = 36 – 28 = 8 सेमी

∴ EC का मान 8 सेमी  है

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