When a circular plate of metal is heated in an oven, its radius increases at a rate of 0.04 cm/min. At what rate is the plate's area increasing when the radius is 59 cm? Write the equation that relates the rate of change in area to the rate of change in radius. dtdA​ if it7​ (Type an expression using r as the variable) The rate of change of the area is (Type an neact answer in tertre of π.)