Which ray is the terminal side of a -90^circ angle in standard position? positivex-axis positive y-axis negative x-axis negative y-axis

## Step 1<br />In trigonometry, an angle in standard position is defined as an angle whose vertex is at the origin and its initial side lies along the positive x-axis. The terminal side of the angle is determined by the rotation of the angle from the initial side.<br /><br />## Step 2<br />A negative angle indicates a clockwise rotation from the initial side. <br /><br />## Step 3<br />A $-90^{\circ }$ angle means a clockwise rotation of 90 degrees from the positive x-axis. <br /><br />## Step 4<br />After a 90-degree clockwise rotation, the terminal side of the angle would be along the negative y-axis.