I need help on pre-calc!?

Question

Find the rectangular coordinates of the point with the polar coordinates ordered pair 7 comma 2 pi divided by 3.

Answer 1

just use the identity you were given...x = r cos Θ & y = r sin Θ

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  Lv 4

  8 months agoReport

  perceptive question and good suggestion; also, /or, standard polar description => Cartesian point on a circle of radius 7 and rotation of +(2π/3)=120°, &
  r=hypotenuse=7, & x²+y²=r², =>
   |x|= 7×(1/2), & |y|= 7×(²√(3)/2), =>
   x= - (7/2), & y= + 7(²√3)/2 , ie, (x₀,y₀) = ( - (7/2), + 7(²√3)/2 ) 
  

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