Tip:A–D to answerE for explanationV for videoS to reveal answer
If A+B+C=0, ∣A∣=3, ∣B∣=5, and ∣C∣=7, then the angle between A and B is:
Explanation
Step 1:
Step 2:
∣A∣2+∣B∣2+2∣A∣∣B∣cosθ=∣C∣2
Step 3:
(3)2+(5)2+2(3)(5)cosθ=(7)2
Step 4:
Step 5:
Final Answer:
The calculated angle is 3π.
Explanation
Step 1:
Step 2:
∣A∣2+∣B∣2+2∣A∣∣B∣cosθ=∣C∣2
Step 3:
(3)2+(5)2+2(3)(5)cosθ=(7)2
Step 4:
Step 5:
Final Answer:
The calculated angle is 3π.
