Math topic中文Polar coordinate equations and applicationsPolar equations of curves, and finding intersections, chord lengths and distancesPractice questions1在平面直角坐标系xOyxOyxOy中,曲线CCC的参数方程为{y=4sinax=4cosa+2(a \begin{cases} \overset{x=4\cos a+2}{y=4\sin a}\end{cases}(a{y=4sinax=4cosa+2(a为参数))),以OOO为极点,以xxx轴…2在直角坐标系xOyxOyxOy中,圆CCC的方程为(x−3)2+(y+1)2=9(x- \sqrt {3})^{2}+(y+1)^{2}=9(x−3)2+(y+1)2=9,以OOO为极点,xxx轴的非负半轴为极轴建立极坐标系. (1)求圆CCC的极坐标方程; (2)直线OPOPOP…3在极坐标系中,圆心为(1,π2)(1, \dfrac {π}{2})(1,2π),且过极点的圆的方程是()()() A. ρ=2sinθρ=2\sin θρ=2sinθ B. ρ=−2sinθρ=-2\sin θρ=−2sinθ C. ρ=2cosθρ=2\cos θρ=2cosθ D. ρ=−2cosθρ=-2\cos θρ=−2cosθ4在极坐标系中,已知直线方程为ρsin(θ+π4)=22ρ\sin (θ+ \dfrac {π}{4})= \dfrac { \sqrt {2}}{2}ρsin(θ+4π)=22,则点A(2,7π4)A(2, \dfrac {7π}{4})A(2,47π)到这条直线的距离为()()() A. 2 \sqrt {2}2…5在平面直角坐标系xOyxOyxOy中,以OOO为极点,xxx轴非负半轴为极轴建立坐标系,曲线MMM的极坐标方程为ρ=4cosθρ=4\cos θρ=4cosθ,直线lll的参数方程为{y=tsinαx=m+tcosα(t \begin{cases} \overset{x=m+t\cos \alpha }{y=t\sin \alpha }\end{cases}(t{y=tsinαx=m+tcosα(t…6在极坐标系中,曲线CCC:ρ=2acosθ(a>0)ρ=2a\cos θ(a > 0)ρ=2acosθ(a>0),直线lll:ρcos(θ−π3)=32ρ\cos (θ- \dfrac {π}{3})= \dfrac {3}{2}ρcos(θ−3π)=23,CCC与lll有且只有一个公共点,求aaa.7在直角坐标系xoyxoyxoy中,曲线C1C_{1}C1,C2C_{2}C2的参数方程分别为{x=5cosθy=5sinθ(θ \begin{cases} x= \sqrt {5}\cos θ \\ y= \sqrt {5}\sin θ\end{cases}(θ{x=5cosθy=5sinθ(θ为参数)))…