We need the circumference and area of the circle equations: c = 2*pi*r a = pi*r^2 lets find the radius from the first equation: r = c/2*pi r = 157/(2*3.14) r = 24.99 ft now lets calculate the area: a = pi*r^2 a = 3.14*(24.99)^2 a = 1960.93 ft^2 Now we need to divide the total area by the rate at which Chris paints, and that gives us the time needed: time = <span>1960.93/400 time = 4.9 hours that would be 5 hours rounded to the nearest hour</span>
