What is the Cartesian form of $( 8, (25pi)/8 )$ ?

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Answer 1 · 2017-05-20T17:37:58

$(-7.391, -3.061)$

The conversion from polar to cartesian coordinates is:
$(x,y) = (rcostheta, rsintheta)$

$x = rcostheta = 8cos(25pi/8)= -7.391$
$y = rsintheta = 8sin(25pi/8) = -3.061$

So the cartesian coordinates are $(-7.391, -3.061)$

What is the Cartesian form of ( 8, (25pi)/8 ) ( 8, (25pi)/8 ) ?