समद्विभुज त्रिकोण ABC मध्ये, AB = AC = 26 सेमेी आणि BC = 20 सेमेी असल्यास, ABC त्रिकोणाचे क्षेत्रफळ काढा.

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  1. 180 सेमी2
  2. 240 सेमी2
  3. 220 सेमी 2
  4. 260 सेमी2

Answer (Detailed Solution Below)

Option 2 : 240 सेमी2
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दिलेल्याप्रमाणे:

समद्विभुज त्रिकोण ABC मध्ये,

AB = AC = 26 सेमी आणि BC = 20 सेमी.

गणना:

F1 Ashish Ravi 25.10.21 D1

ABC या त्रिकोणामध्ये,

∆ADC = 90° (समद्विभुज त्रिकोणातील मध्यबिंदूवर विरुद्ध शिरोबिंदूपासून असमान बाजूपर्यंत रेषेने तयार केलेला कोन 90° आहे)

तर,

AD² + BD² = AB² (पायथागोरस प्रमेयानुसार)

⇒ AD² = 576

⇒ AD = 24

त्रिकोणाचे क्षेत्रफळ = ½(पाया × उंची)

⇒ ½(20 × 24) (त्रिकोणाचे क्षेत्रफळ = (1/2) पाया × उंची)

⇒ 240 सेमी²

∴ योग्य निवड पर्याय 2 आहे.

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