The unit vectors \(\mathbf { i }\) and \(\mathbf { j }\) are perpendicular.
Find the magnitude of the vector \(- 20 \mathbf { i } + 21 \mathbf { j }\)
Circle your answer. [0pt]
[1 mark]
\(\begin{array} { l l l l } - 1 & 1 & \sqrt { 41 } & 29 \end{array}\)
13
The angle between the vector \(\mathbf { i }\) and the vector \(- 20 \mathbf { i } + 21 \mathbf { j }\) is \(\theta\)
Which statement about \(\theta\) is true?
Circle your answer. [0pt]
[1 mark]
$$0 ^ { \circ } < \theta < 45 ^ { \circ } \quad 45 ^ { \circ } < \theta < 90 ^ { \circ } \quad 90 ^ { \circ } < \theta < 135 ^ { \circ } \quad 135 ^ { \circ } < \theta < 180 ^ { \circ }$$