What is the distance between $(2 , (5 pi)/8 )$ and $(-1 , (2 pi )/3 )$ ?

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Answer 1 · 2016-03-16T16:37:53

$=sqrt((5+4cos(pi/24))$ unit

Distance $=sqrt(r_1^2+r_2^2-2r_1r_2cos(theta_1-theta_2))$
$=sqrt((2)^2+(-1)^2-2*2*-1*cos(5pi/8-2pi/3))$
$=sqrt((5+4cos(pi/24))$

What is the distance between (2 , (5 pi)/8 )(2 , (5 pi)/8 ) and (-1 , (2 pi )/3 )(-1 , (2 pi )/3 )?