💬 👋 We’re always here. Join our Discord to connect with other students 24/7, any time, night or day.Join Here!

Like

Report

ag
Numerade Educator

Like

Report

Problem 9 Easy Difficulty

Find $ a \cdot b $.

$ \mid a \mid = 7 $ , $ \mid b \mid = 4 $ , the angle between $ a $ and $ b $ is $ 30^\circ $

Answer

$a \cdot b=14 \sqrt{3}$

Discussion

You must be signed in to discuss.

Video Transcript

to remember that a dot B is ninety two. Today was magnitude of B times co sign of the angle. So a dot B we just plug everything in that four times. Seven times co sign of thirty degrees twenty eight times rat three over to. So we got fourteen. Rat three is adoptee.