求半径为a,高度为h(0
问题描述:
求半径为a,高度为h(0
答
S=∫(0,h)∫(0,a)(2π)dadh
=∫(0,h)2πadh
=2πah
求半径为a,高度为h(0
S=∫(0,h)∫(0,a)(2π)dadh
=∫(0,h)2πadh
=2πah