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Jawab: X= r . cos α
= 14 . cos 60
= 14 . cos (90-30)
= 14 . (- cos 30)
= 14 . (-1/2 √ 3) = -7 √3
y= r . sin α
= 14 . sin 60
= 14 . sin (90-30)
= 14 . sin 30
= 14. 1/2
= 7
jadi, P (x,y) = (-7√3 , 7)
x = r cos a = 14 . cos 60° = 14 . 1/2 = 7
y = r sin a = 14 . sin 60° = 14 . 1/2√3 = 7√3
koordinat cartesiusnya= (7,7√3)