## Answers

#### Explanation:

#color(orange)"Reminder"#

#• r=sqrt(x^2+y^2)#

#rArrsqrt(x^2+y^2)=3#

#"squaring both sides"#

#rArrx^2+y^2=9larr" in rectangular form"#

#"this is the equation of a circle, centred at O, with radius 3"#

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