A circle of radius R is centered at the origin. The y-intercept (positive) is at (0, R). As we shift the circle to the left (or right) by n on the x-axis, the y-intercept decreases. Are we able to determine the radius of the circle given a certain proportion between the x-shift and the decrease in y-intercept? Say, if x is shifted by 45, then the y-intercept decreases by 5, what is the radius?