The Cartesian coordinates of a point are given. (i) Find polar coordinates (r

Tazmin Horton

Tazmin Horton

Answered question

2021-10-25

The Cartesian coordinates of a point are given.

(i) Find polar coordinates (r,θ) of the point, where r>0and0θ<2π.

(ii) Find polar coordinates (r,θ) of the point, where r<0 and 0θ<2π. (33,3)

Answer & Explanation

Alannej

Alannej

Skilled2021-10-26Added 104 answers

Here given rectangular coordinate (x,y)=(33,3) which is in First Quadrant
Now use the relation r=x2+y2 we need to find out value of r>0
r=(33)2+32=6
The angle θ is given by
θ=tan1(yx)=tan1(333)
θ=tan1(13)
Since the point is in first quadrant and tanπ6=13 we will consider θ=π6
Polar coordinate for r>0 is (r,θ)=(6,π6)
Other representation of r<0 are P(r,θ)=P(r,θ+(2n+1)π)
(6,π6+π)=(6,7π6)   add π
Result:
(6,π6) and (6,7π6)

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