Kerjakan Dengan Cara!
Jawaban No 8
a . b = |a| . |b| . cos 30°
= 4 × 5 × cos 30°
= 20 × √3/2
= 10√3
Jawaban No 9
a . b = |a| . |b| . cos (180 - 45)°
= 6 × 3 × cos 135°
= 6 × 3 × - √2 / 2
= 18 × - √2 / 2
= - 9√2
Jawaban No 10
a . b = |a| . |b| . cos (240 - 180)°
= 8 × 6 × cos 60°
= 8 × 6 × ½
= 48 × ½
= 24
Jawaban No 11
a . b = |a| . |b| . cos (180 - 30)°
= 5 × 4 × cos 150°
= 20 × - √3 / 2
= - 10√3
Jawaban:
Semoga bermanfaat........................
[answer.2.content]
