On a unit circle, the vertical distance from the x-axis to a point on the perimeter
On a unit circle, the vertical distance from the x-axis to a point on the perimeter of the circle is twice the horizontal distance from the y-axis to the same point. What is sine? A unit circle is shown. A radius with length 1 forms angle theta in quadrant 1. One-fifth StartFraction StartRoot 5 EndRoot Over 5 EndFraction StartFraction 2 StartRoot 5 EndRoot Over 5 EndFraction 2