Your physics class decides to perform an experiment on circular waves. First, you make sure the water in the school swimming pool is level with by no waves. Next, a volunteer tosses a small
marble near the center of the pool.
Your teacher tells you the radius in feet, r(t), of the outer ripple
is given by r(t) = 0.73t, where t is the time in seconds after the marble hits the water given. The
area of the circle is given by the function Ar) = mra, where A(r) is the area in square feet and r is
the radius in feet. Give an eaquation for the function