考虑纵切面,相当于半径为旁唤r的圆内切祥孝于等腰三角形中,高h>2r设三角形顶角为2a,则sin(a)=r/(h-r)设圆锥底面运宴凯半径为R,则等腰三角形底边长2RR^2/h^2=(tan(a))^2=(sin(a))^2/(cosa)^2=r^2/(h^2-2hr)圆锥体积为1/3*pi*R^2*h=1/3*pi*(r^2*h^3)/(h^2-2hr)定义域h>2r
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