SubArea: Angles, arcs and sectorsLevel: BProject ID: 1003055103Accepted: 1Clonable: 0Easy: 1Find out for which \( k\in\mathbb{Z} \) is true: \[ -\frac{11}4\pi = \frac74\pi+k\frac{\pi}2 \]\( -9 \)\( 9 \)\( -18 \)\( 18 \)
