能教我怎么已知弦长和弧长求弓形面积吗?
来源:学生作业帮 编辑:作业帮 分类:数学作业 时间:2024/11/05 22:51:37
能教我怎么已知弦长和弧长求弓形面积吗?
弧长2.14,弦长2.04,求弓形面积?
弧长2.14,弦长2.04,求弓形面积?
已知弧长C=2.14,弦长L=2.04,求弓形面积S?
弧半径为R,弧所对的圆心角为A.用下式来求得R
Rn+1=(1+(L-2*Rn*SIN(C/(2*Rn)))/(L-C*COS(C/(2*Rn))))*Rn
R0=2
R1=2.006
R2=2.006
R=2.006
A=C/R=2.14/2.006=1.0667996弧度
S=π*R^2*A/(2*π)-(L/2)*(R^2-(L/2)^2)^0.5
=R^2*A/2-(L/2)*(R^2-(L/2)^2)^0.5
=2.006^2*1.0667996/2-(2.14/2)*(2.006^2-(2.14/2)^2)^0.5
=0.3308
再问: ������Dz��Ǽ�����ˣ����ٿ���������L/2����C/2��
再答: �ǣ� S=��*R^2*A/(2*��)-(L/2)*(R^2-(L/2)^2)^0.5 =R^2*A/2-(L/2)*(R^2-(L/2)^2)^0.5 =2.006^2*1.0667996/2-(2.14/2)*(2.006^2-(2.14/2)^2)^0.5 =0.3308
再问: �����㲻�Ǵ����L�����Ǵ����C���㿴���Բ���
再答: �Բ������Ҵ���ˣ� S=��*R^2*A/(2*��)-(L/2)*(R^2-(L/2)^2)^0.5 =R^2*A/2-(L/2)*(R^2-(L/2)^2)^0.5 =2.006^2*1.0667996/2-(2.04/2)*(2.006^2-(2.04/2)^2)^0.5 =0.3846
弧半径为R,弧所对的圆心角为A.用下式来求得R
Rn+1=(1+(L-2*Rn*SIN(C/(2*Rn)))/(L-C*COS(C/(2*Rn))))*Rn
R0=2
R1=2.006
R2=2.006
R=2.006
A=C/R=2.14/2.006=1.0667996弧度
S=π*R^2*A/(2*π)-(L/2)*(R^2-(L/2)^2)^0.5
=R^2*A/2-(L/2)*(R^2-(L/2)^2)^0.5
=2.006^2*1.0667996/2-(2.14/2)*(2.006^2-(2.14/2)^2)^0.5
=0.3308
再问: ������Dz��Ǽ�����ˣ����ٿ���������L/2����C/2��
再答: �ǣ� S=��*R^2*A/(2*��)-(L/2)*(R^2-(L/2)^2)^0.5 =R^2*A/2-(L/2)*(R^2-(L/2)^2)^0.5 =2.006^2*1.0667996/2-(2.14/2)*(2.006^2-(2.14/2)^2)^0.5 =0.3308
再问: �����㲻�Ǵ����L�����Ǵ����C���㿴���Բ���
再答: �Բ������Ҵ���ˣ� S=��*R^2*A/(2*��)-(L/2)*(R^2-(L/2)^2)^0.5 =R^2*A/2-(L/2)*(R^2-(L/2)^2)^0.5 =2.006^2*1.0667996/2-(2.04/2)*(2.006^2-(2.04/2)^2)^0.5 =0.3846