A circle has a radius that increases at a rate of 10cm/s. Find the equation of the outermost circle 6 seconds after it starts to expand. Using x2 +y2=r2
r = 0 I assume at t = 0
r (t) = 0 + 10 t
r(6) = 60 cm
60^2 = 3600
x^2 + y^2 = 3600 cm^2
r (t) = 0 + 10 t
r(6) = 60 cm
60^2 = 3600
x^2 + y^2 = 3600 cm^2