1) Find an equation of one variable of an isosceles triangle inscribed in a circle.
2) Find an equation of one variable for the volume of a right circular cylinder inscribed in a cone of height h and radius r with the base of the cylinder on the base of the cone.
3) Find the equation of one variable for the surface area of a right circular cylinder inscribed in a cone of a height h and radius r with the base of the cylinder on the base of the cone.