1.Nyatakan koordinat kartesius dibawah ini dalam koordinat kutub !
a) {3,3} b) {-5,-5} c) {-2,2} d) {1,}
Penyelesaian :
a ) r =
=
=
=
r = 6
tg = =
tg = = =
arc tg = 30o
= 30o
maka
koordinat kutub (r,) = (6,30o)
b) r
=
r =
r
=
r =
r = 5
tg = = = 1
arc tg 0
= 2250
maka
koordinat kutub (r,= (5,2250)
c) r =
r =
r =
r =
r = 4
tg = = = -
arc tg - = 120o
= 120o
Maka kkoordinat kutub (r, ) = (4,120o)
d) r =
r =
r =
r = = 2
tg = = = -
arc tg - = 300o
= 300o
Maka koordinat kutub (r, ) = (o
)
2. N yatakan koordinat
kutub dibawah ini dalam koordinat kartesius !
a) (8, 30o) b) (2, 1200) c) (4, 2400) d) (20,3300)
Penyelesaian :
a)
X = r cos
= 8 cos 30o
= 8 .
x = 4
y = r
sin
= 8 sin 30o
= 8 .
= 4
Maka
koordinat kartesius (x,y) = (4 4)
b)
X = r cos
= 2 cos 1200
= 2 .
-
= - 1
Y = r
sin
= 2 sin 1200
= 2 . =
Maka koordinat
kartesius (x,y) = (-1
, )
c)
X = r cos
= 4 cos 2400
= 4 . -
= - 2
Y = r sin
= 4 sin 2400
= 4 . - = - 2
Maka koordinat kartesius (x,y)
= (-2, -2 )
d) X = r cos
= 20
cos 3300
= 20 . = 10
Y = r sin
= 20
sin 3300
= 20 .
-
Y = -10
Maka
koordinat kartesius (x , y)
= (10 )
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