A line perpendicular to the y-axis, which is vertical, is a line that is horizontal. Perfectly horizontal lines always have a slope of 0. Thus, the equation of the line perpendicular to the one given and passing through the given point (5, 1) is
The radius is from center to point on a circle. So your task is count distance between two points: S(10,6) and A(-3,3). Distance between two points A(x1, y1) and B(x2, y2) count from this formula:
