ΔABC केंद्र O वाले एक वृत्त के अंतर्गत है। यदि AB = 17 सेमी, BC = 10 सेमी और AC = 9 सेमी है, AO की लंबाई ज्ञात कीजिए। 

  1. 18 सेमी
  2. 10.6 सेमी
  3. 106 सेमी
  4. 36 सेमी

Answer (Detailed Solution Below)

Option 2 : 10.6 सेमी
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Detailed Solution

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उपयोग की गई संकल्पना:

परित्रिज्या की लंबाई = (A × B × C)/(4 × Δ)    

जहां A, B, C त्रिभुज की 3 भुजाओं की लंबाई हैं

Δ → त्रिभुज का क्षेत्रफल

त्रिभुज का क्षेत्रफल = √{s(s - a)(s - b)(s - c)}   

जहां a, b, c त्रिभुज की 3 भुजाओं की लंबाई हैं

s → अर्द्धपरिधि

गणना:

F1 Harshit 1.2.21 Pallavi D1

s = (a + b + c)/2

⇒ s = (10 + 9 + 17)/2

⇒ s = 18

ΔABC का क्षेत्रफल = √{18(18 - 10)(18 - 9)(18 - 17)

⇒ √(18 × 8 × 9 × 1)

⇒ 36 सेमी2

त्रिभुज की परित्रिज्या = (a × b × c)/4Δ

⇒ (10 × 17 × 9)/(4 × 36)

⇒ 10.6 सेमी

∴ त्रिभुज की परित्रिज्या 10.6 सेमी है।

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