एक त्रिभुज के शीर्ष A(1, 1),B(0, 0) और C(2, 0) हैं। त्रिभुज के कोण समद्विभाजक P पर मिलते हैं। P के निर्देशांक क्या है?

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NDA-I (Mathematics) Official Paper (Held On: 13 Apr, 2025)
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  1. \((1, \sqrt{2} −1)\)
  2. \((1, \sqrt{3} −1)\)
  3. (1,1/2)
  4. \((1/2, \sqrt{2}-1)\)

Answer (Detailed Solution Below)

Option 1 : \((1, \sqrt{2} −1)\)
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गणना:

दिए गए बिंदु A(1,1), B(0,0), और C(2,0) हैं। कोण समद्विभाजक P (अंतःकेन्द्र) पर मिलते हैं।

भुजा की लंबाई की गणना करें:

\(a = BC = \sqrt{(2 - 0)^{2} + (0 - 0)^{2}} = 2\)

\(b = CA = \sqrt{(1 - 2)^{2} + (1 - 0)^{2}} = \sqrt{2}\)

\(c = AB = \sqrt{(1 - 0)^{2} + (1 - 0)^{2}} = \sqrt{2}\)

इसलिए, \(a + b + c = 2 + \sqrt{2} + \sqrt{2} = 2 + 2\sqrt{2}.\)

अंतःकेन्द्र सूत्र से,

\(X_{P} \;=\; \frac{a\,x_{A} + b\,x_{B} + c\,x_{C}}{a + b + c} \;=\; \frac{\,2\cdot 1 + \sqrt{2}\cdot 0 + \sqrt{2}\cdot 2\,}{\,2 + 2\sqrt{2}\,} \;=\; \frac{2 + 2\sqrt{2}}{2 + 2\sqrt{2}} \;=\; 1.\)

\(Y_{P} \;=\; \frac{a\,y_{A} + b\,y_{B} + c\,y_{C}}{a + b + c} \;=\; \frac{\,2\cdot 1 + \sqrt{2}\cdot 0 + \sqrt{2}\cdot 0\,}{\,2 + 2\sqrt{2}\,} \;=\; \frac{2}{2 + 2\sqrt{2}} \;=\; \frac{1}{\,1 + \sqrt{2}\,} \;=\; \sqrt{2} \;-\; 1. \)

∴ अंतःकेन्द्र \(P = \bigl(1,\;\sqrt{2} - 1\bigr) \) है।

इसलिए, सही उत्तर विकल्प 1 है।

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