∵ρsin(θ+
π
4 )=2,
∴ρsinθ-ρcosθ=2
2 ,化成直角坐标方程为:
x-y+2
2 =0,
圆ρ=4化成直角坐标方程为x 2+y 2=16,
圆心到直线的距离为: d=
|2
2 |
2 =2
∴截得的弦长为:
2×
R 2 - d 2 = 2×
16-4 =4
3 .
故答案为: 4
3 .
∵ρsin(θ+
π
4 )=2,
∴ρsinθ-ρcosθ=2
2 ,化成直角坐标方程为:
x-y+2
2 =0,
圆ρ=4化成直角坐标方程为x 2+y 2=16,
圆心到直线的距离为: d=
|2
2 |
2 =2
∴截得的弦长为:
2×
R 2 - d 2 = 2×
16-4 =4
3 .
故答案为: 4
3 .