Vectors and Advanced Pure Extensions
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Free Maths Q & A Practice
1 of 5 free exam-style exercises in this topic
Find the angle between \(a=(1,2,2)\) and \(b=(2,-1,2)\).
Three-dimensional vectors
Method: Use a dot b = |a||b| cos theta
Select the exact answer.
Select one option.
A
\(\cos^{-1}(1/9)\)
B
\(\cos^{-1}(4/9)\)
C
\(\cos^{-1}(2/3)\)
D
\(60^\circ\)
E
\(90^\circ\)
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