Due to a lightening strike, a forest fire begins to burn and is spreading outward in a shape that is roughly circular. The radius of the circle is modeled by the function r(t) = 3t, where t is the time in minutes and r is measured in meters. Write a function for the area burned by the fire directly as a function of t.

Question

A) (A ? r)(t) = 3?t² C) (A ? r)(t) = 6?t
B) (A ? r)(t) = 9?t² D) (A ? r)(t) = 3?2t²

Answer 1

B) (A ? r)(t) = 9?t²