圆心角为A=30度,半径为R=3的扇形的弧长为C()周长为L()面积为S()
C=2*PI*R*30/360
=2*PI*3*30/360
=0.5*PI
L=C+2*R
=0.5*PI+6
S=PI*R^2*30/360
=PI*3^2/12
=0.75*PI
圆心角为A=30度,半径为R=3的扇形的弧长为C=0.5*PI,周长为L=0.5*PI+6,面积为S=0.75*PI.
圆心角为A=30度,半径为R=3的扇形的弧长为C()周长为L()面积为S()
C=2*PI*R*30/360
=2*PI*3*30/360
=0.5*PI
L=C+2*R
=0.5*PI+6
S=PI*R^2*30/360
=PI*3^2/12
=0.75*PI
圆心角为A=30度,半径为R=3的扇形的弧长为C=0.5*PI,周长为L=0.5*PI+6,面积为S=0.75*PI.