jawaban soal nomer 5 r = 6 cos 135 = -1/2√2 sin 135 = 1/2√2 x = r x cos α = 6 x -1/2√2 = -3√2 y = r x sin α = 6 x 1/2 √2 = 3√2 koordinat cartesiusnya = ( -3√2, 3√2)
jawaban soal nomer 6 b/sin b = c / sin c b x sin c = c x sin b b x sin 30 = 20 x sin 45 b x 1/2 = 20 x 1/2√2 b x 1/2 = 10√2 b = 2 x 10√2 b = 20√2 cm
jawaban soal nomer 5
r = 6
cos 135 = -1/2√2
sin 135 = 1/2√2
x = r x cos α
= 6 x -1/2√2
= -3√2
y = r x sin α
= 6 x 1/2 √2
= 3√2
koordinat cartesiusnya = ( -3√2, 3√2)
jawaban soal nomer 6
b/sin b = c / sin c
b x sin c = c x sin b
b x sin 30 = 20 x sin 45
b x 1/2 = 20 x 1/2√2
b x 1/2 = 10√2
b = 2 x 10√2
b = 20√2 cm
=
=
Q ( 6 , 135° ) ⇒ r = 6 ; α = 135°
x = r. cos α
= 6 . cos 135°
= 6 .
= - 3√2
y = r . sin 135°
= 6 .
= 3√2
Q ( 6 , 135° ) ⇔ Q ( - 3√2 , 3√2 )
b / sin B = c / sin C
b / sin 45° = 20 / sin 30°
b / = 20 /
b / = 40
b = . 40
= 20√2