B

Given points \(A = [1;1]\), \(B = [5;2]\) and \(C = [8;7]\), find the angle \(\measuredangle ABC\).

Consider a parallelogram \(ABCD\) with \(A = [1;3]\), \(B = [2;-1]\) and \(C = [5;1]\). Let \(S\) be the center of the diagonal \(BD\). Find the vector \(\overrightarrow{AS } \).

Find the angle between two lines and round your answer to the nearest minute. \[ \begin{aligned}p\colon x& = 2 - t , & \\y & = 3t , \\z & = 1 ;\ t\in \mathbb{R} \\ \end{aligned}\qquad \qquad \begin{aligned}q\colon x& = 2s, & \\y & = 4s , \\z & = 1 - s;\ s\in \mathbb{R} \\ \end{aligned} \]

Given points \(A = [0;1;2]\), \(B = [1;2;0]\), \(C = [1;2;3]\), find the angle between the lines \(AB\) and \(AC\). Round your answer to the nearest degree.