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JEE Mains · Maths · STD 11 - Trigonometrical equations

एक त्रिभुज \(ABC\) के कोण \(A , B\) तथा \(C\) समान्तर श्रेणी में है तथा \(a : b =1: \sqrt{3}\) है। यदि \(c =4\) सेमी है, तो इस त्रिभुज का क्षेत्रफल (वर्ग सेमी में) है

  1. A \(2\sqrt 3\)
  2. B \(\frac{4}{{\sqrt 3 }}\)
  3. C \(4\sqrt 3\)
  4. D \(\frac{2}{{\sqrt 3 }}\)
Verified Solution

Answer & Solution

Correct Answer

(A) \(2\sqrt 3\)

Step-by-step Solution

Detailed explanation

\(\angle B\, = \,\frac{\pi }{3},\) by sine Rule \(\sin \,A\, = \frac{1}{2}\) \( \Rightarrow \,A\, = \,{30^o},\,a\, = \,2\,,\,b\, = \,2\sqrt 3 \,,\,c\, = \,4\) \(\Delta = \frac{1}{2} \times 2\sqrt 3 \times 2\, = \,2\sqrt 3 \,sq.\,cm\)
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