Ex 29

Question

Solution

Question a)

Question b :

  • \((\overrightarrow{AC},\overrightarrow{AB})=-(\overrightarrow{AB},\overrightarrow{AC})\color{red}\underline{~=-\dfrac \pi 3}\) (figure[1])

  • \((\overrightarrow{BA},\overrightarrow{BC})\color{red}\underline{~=-\dfrac \pi 3}\) (figure[2])

  • \((\overrightarrow{BC},\overrightarrow{BA})\color{red}\underline{~=\dfrac \pi 3}\) (figure[3])

  • \((\overrightarrow{CA},\overrightarrow{CB})\color{red}\underline{~=\dfrac \pi 3}\) (figure[4])

  • \((\overrightarrow{CB},\overrightarrow{CA})\color{red}\underline{~=-\dfrac \pi 3}\) (figure[5])