A cylinder has a circular base with a radius r. The height of the cylinder is half of r.Use the fact that the volume of a cylinder with a circular base is 휋푟:ℎ.a.Find a function that models the surface area Softhe cylinder in terms of r. Use correct function notation.b.Find a function that models the volume Vofthe cylinderin terms of r only.Use correct function notation.c.Find a function that models the surface area Sof the cylinderin terms of its volume V. Use correct function notatio