Question

Sa se determine modulul vectorilor AB,BC,CA daca:
A(0;-2) B(-2;1) C(2;2)

Answer 1

Modulu vectorului AB=$\sqrt{( x_{B}- x_{A})^2+( y_{B} - y_{A})^2 } }= \sqrt{(-2-0)^2+(1+2)^2}= \sqrt{13}$, BC=$\sqrt{(2+2)^2+(2-1)^2}= \sqrt{17},si,CA= \sqrt{(2-0)^2+(-2-2)^2} = \sqrt{20}$=2√5.