Tentukan koordinat cartesius jika diketahui koordinat kutub P (18,225°)​

P(18 , 225°)

r = 18

a° = 225°

x = r.cos a°

x = 18.cos 225°

x = 18.(-1/2 V2)

x = -9V2

y = r.sin a°

y = 18.sin 225°

y = 18.(-1/2 V2)

y = -9V2

jadi koordinat cartesius kutub P(-9V2 , -9V2)