Jawaban:
7. cos 150 = -½√3
cos 120 = -½
jd cos 150 - cos 120 = ½ - ½√3
sin 210 = -½
sin 300 = -½√3
jd sin 210 - sin 300 = ½√3 - ½
maka hasilnya -1
8. R = √(1+3) = 2
tan @ = -√3 (kuadran 2) ==> @ = 120°
jd (2, 120°)
10. x = 6 cos 240 = 6× -½= -3
y = 6. sin 240 = 6 × -½√3 = -3√3
koordinat cartesius (-3, -3√3)
13. cari sudut L= 180 - (30+105) = 45°
maka sin K/LM = sin L/KM
sin 30/8 = sin 45/KM
KM = 16 × ½√2 = 8√2
16. Luas segitiga = 8×12×½× sin 120 = 24√3 cm²
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Jawaban:
7. cos 150 = -½√3
cos 120 = -½
jd cos 150 - cos 120 = ½ - ½√3
sin 210 = -½
sin 300 = -½√3
jd sin 210 - sin 300 = ½√3 - ½
maka hasilnya -1
8. R = √(1+3) = 2
tan @ = -√3 (kuadran 2) ==> @ = 120°
jd (2, 120°)
10. x = 6 cos 240 = 6× -½= -3
y = 6. sin 240 = 6 × -½√3 = -3√3
koordinat cartesius (-3, -3√3)
13. cari sudut L= 180 - (30+105) = 45°
maka sin K/LM = sin L/KM
sin 30/8 = sin 45/KM
KM = 16 × ½√2 = 8√2
16. Luas segitiga = 8×12×½× sin 120 = 24√3 cm²