Trigonometry (11th Edition) Clone

A positive angle measurement means the angle is measured from the positive x-axis going counterclockwise. Since $2\pi \approx 6.28$ and $2.5\pi=\frac{5\pi}{2} \approx 7.85$, then$7$ radians is between $2\pi$ and $\frac{5\pi}{2}$. $2\pi$ is the positive x-axis while $\frac{5\pi}{2}$ is the positive y-axis. Thus, $7$ radians must be in Quadrant I.