1. The problem asks why a vector \(\vec{A}\) has an angle of 270°. 2. In a 2D coordinate system, angles are typically measured from the positive x-axis, moving counterclockwise. 3. An angle of 270° means the vector points straight down along the negative y-axis. 4. This is because 0° points right (positive x), 90° points up (positive y), 180° points left (negative x), and 270° points down (negative y). 5. So, if \(\vec{A}\) has an angle of 270°, it means its direction is vertically downward. 6. This is a standard convention in polar coordinates and vector direction measurement.