math
posted by sn .
a ferris wheel has the diameter of 240 feet and the bottom of the ferris wheel is 9 feet above the ground. find the equation of the wheel if the origin is placed on the ground directly below the center of the wheel

If a circle of radius r has center at (h,k) the equation of the circle is
(xh)² + (yk)² = r²
So, plug and chug:
x² + (y(120+9))² = 120²
x² + (y129)² = 14400