<Li> arc length L </Li> <Dl> <Dd> L = c = 2 π r (\ displaystyle L = c = 2 \ pi r) </Dd> </Dl> <Dd> L = c = 2 π r (\ displaystyle L = c = 2 \ pi r) </Dd> <Ul> <Li> central angle φ in radians </Li> </Ul>

Who discovered the formula for the volume of a cone