What is the Cartesian form of $( 9 , (25pi)/12 )$ ?

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Answer 1 · 2018-04-25T02:46:38

$( 9 cos(25pi/12), 9 sin(25pi/12) )$

if $(r, phi) = (9, 25pi/12)$

Link between polar coordinates and Cartesian coordinates:
$x=rcos(phi), y=rsin(phi)$
r is the distance from the (0,0), and $phi$ is the angle.

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Now
$x = 9 cos(25pi/12)$
$y = 9 sin(25pi/12)$

What is the Cartesian form of ( 9 , (25pi)/12 ) ( 9 , (25pi)/12 ) ?