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Last updated at May 6, 2021 by Teachoo

Example 13 Find the angle between two vectors π β and π β with magnitudes 1 and 2 respectively and when π β β π β =1. "Given |" π β"| = 1 , |" π β"| = 2 , " "and " π β". " π β" = 1" We know that π β . π β = "|" π β"|" "|" π β"|" cos ΞΈ where ΞΈ is the angle between π β and π β Putting values in formula π β . π β = "|" π β"|" "|" π β"|" cos ΞΈ 1 = 1 Γ 2 Γ cos ΞΈ cos ΞΈ = 1/2 cos ΞΈ = cos π /π So, ΞΈ = π /π Thus angle b/w π β and π β is π/3 .