Maximizing volume question where you must create the equation... Please help?

A sector of a circle with central angle theta is cut from a circle with radius R. The edges of teh sector are then glued to form a cone. Find the value of theta that produces a cone with maximum volume. Please show all work! NEEDS TO BE CALCULATED BY USING DERIVATIVES AND RELATIVE MAXIMUMS. If you need a picture I... show more A sector of a circle with central angle theta is cut from a circle with radius R. The edges of teh sector are then glued to form a cone. Find the value of theta that produces a cone with maximum volume. Please show all work! NEEDS TO BE CALCULATED BY USING DERIVATIVES AND RELATIVE MAXIMUMS.
If you need a picture I can send one through email.
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