त्रिभुज ABC की भुजाओं AB और AC पर क्रमशः D और E बिंदु इस प्रकार हैं कि AD = 3 सेमी, BD = 3 सेमी, BC = 7.5 सेमी और DE ॥ BC है। तब DE की लंबाई (सेमी में) है:

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Bihar STET TGT (Maths) Official Paper-I (Held On: 04 Sept, 2023 Shift 1)
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  1. 2.5
  2. 3.75
  3. 5
  4. 6

Answer (Detailed Solution Below)

Option 2 : 3.75
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दिया गया है:

DE ॥ BC

AD = 3 cm

BD = 3 cm

BC = 7.5 CM

गणना:

F1 Teaching Arbaz 24-1-24 D5

ΔABC और ΔADE में,

∠ADE = ∠ABC (संगत कोण)

∠AED = ∠ACB  (संगत कोण)

इसलिए, कोण कोण गुणधर्म के अनुसार ΔABC और ΔADE समान है।  

AD/DE = AB/BC

⇒ 3/DE = 6/7.5

⇒ DE = 3.75

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