题错了吧!圆锥怎么能有圆心角,面积和弧长?
应该是扇形吧!
l为弧长,r为半径,s为面积,a为圆心角,c为周长
l=根号(4∏as/360)
r=根号(360s/a∏)
c=2∏r
=2∏*根号(360s/a∏)
=根号(4*360∏s/a)
l=ac/360
=a/360*根号(4*360∏s/a)
=根号(4∏as/360)
题错了吧!圆锥怎么能有圆心角,面积和弧长?
应该是扇形吧!
l为弧长,r为半径,s为面积,a为圆心角,c为周长
l=根号(4∏as/360)
r=根号(360s/a∏)
c=2∏r
=2∏*根号(360s/a∏)
=根号(4*360∏s/a)
l=ac/360
=a/360*根号(4*360∏s/a)
=根号(4∏as/360)