శీర్షాలు (3, 13), (5, -8), మరియు (4, -2) గా ఉన్న త్రిభుజ వైశాల్యం కనుగొనండి?

  1. \(\frac72\) చ.యూనిట్లు
  2. 17 చ.యూనిట్లు
  3. 19 చ.యూనిట్లు
  4. \(\frac92\) చ.యూనిట్లు

Answer (Detailed Solution Below)

Option 4 : \(\frac92\) చ.యూనిట్లు
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సిద్ధాంతం:

శీర్షాలు (x1, y1), (x2, y2) మరియు (x3, y3) గా ఉన్న త్రిభుజ వైశాల్యం ఈ సూత్రం ద్వారా ఇవ్వబడుతుంది

వైశాల్యం = \(\frac{1}{2} \left |\begin{array}{ccc} \rm x_1&\rm y_1&1\\\rm x_2&\rm y_2& 1\\\rm x_3&\rm y_3&1\end{array}\right|\)

 

గణన:

ఇక్కడ, శీర్షాలు (3, 13), (5, -8), మరియు (4, -2)

∴ త్రిభుజ వైశాల్యం = \(\frac{1}{2} \left |\begin{array}{ccc} \rm 3&\rm 13&1\\\rm 5&\rm -8& 1\\\rm 4&\rm -2&1\end{array}\right|\)

\(=\frac12[3(-8+2)-13(5-4)+1(-10+32)]\)

\(=\frac12|-18-13+22|\)

\(=\frac12|-9|\)

\(=\frac92\) చ.యూనిట్లు

కాబట్టి, 4వ ఎంపిక సరైనది.

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