$\tiny{s6.12.7}\\$$\textsf{7.Find the lengths of the ides of the triangle PQR.}\\$ $\textsf{Is it a right triangle? Is it an isosceles riangle?}\\$ \begin{align}\displaystyle&P(3, -2, -3), \; Q(7,0,1), \; R(1,2,1)\\&\left| PQ \right|=\sqrt{(3-7)^2 +(-2-0)^2+(-3-1)^2}\end{align} $\textit{this is just an intro to vector calculus to get the basics of calc III which starts in Jan }$ ☕