Q21 of 34 Page 1030

Find the angle between and when

i. and


ii. and


i)


We know that ,



⇒


⇒


⇒ cosθ = √3/2


⇒ θ = cos - 1(√3/2) = 30⁰ =


Ans: θ = cos - 1(√3/2) = 30⁰ =


ii)


We know that ,



⇒


⇒


⇒ cosθ = - 1/2


⇒ θ = cos - 1( - 1/2) = 120⁰ =


Ans: θ = cos - 1( - 1/2) = 120⁰ =


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