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JEE Mains · Maths · STD 12 - 10. vector algebra

ત્રિકોણ \(\mathrm{ABC}\) માં જો  \(|\overrightarrow{\mathrm{BC}}|=3,|\overrightarrow{\mathrm{C}}|=5\) અને  \(|\overrightarrow{\mathrm{BA}}|=7\), હોય તો સદીશ \(\overline{\mathrm{BA}}\) નો  \(\overline{\mathrm{BC}}\) પરનો પ્રક્ષેપનું માન મેળવો.

  1. A \(\frac{11}{2}\)
  2. B \(\frac{13}{2}\)
  3. C \(\frac{19}{2}\)
  4. D \(\frac{15}{2}\)
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Answer & Solution

Correct Answer

(A) \(\frac{11}{2}\)

Step-by-step Solution

Detailed explanation

Projection of \(\overline{B A}\) on \(\overrightarrow{\mathrm{BC}}\) is equal to \(=|\vec{BA}| \cos \, A B C\) \(\cos \theta=\frac{49+9-25}{2.7 .3}=\frac{11}{14}\) \(\therefore B A \cos \theta=\frac{11}{2}\)
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