# What is the angle between <-8,-5,2 >  and <9,1,-3> ?

May 20, 2016

Angle between vectors is approximately **154.5°**.

#### Explanation:

I've added image which might help

Actually the inverse cosine is approximately 154.5° instead of 90°. We cannot tell what happened to make the mistake, but it looks as if the answerer forgot the decimal point in 91.99 when entering the inverse trigonometric function into the calculator.