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|a + b + c| from the magnitudes and the angles between the vectors

This type of question, asked 2 times: 14 May 2024 S2, 13 Apr 2026 S1. All 2 questions below, oldest first.

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  1. Question 1

    14 May 2024 S2

    104
    ∣a⃗∣=2,∣b⃗∣=3,∣c⃗∣=5|\vec{a}| = 2, |\vec{b}| = 3, |\vec{c}| = 5 and each angle between pairs is 60°60°, then the value of ∣a⃗+b⃗+c⃗∣|\vec{a} + \vec{b} + \vec{c}| is

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  2. Question 2

    13 Apr 2026 S1

    88
    Let aˉ,bˉ,cˉ\bar{a}, \bar{b}, \bar{c} be unit vectors such that aˉ\bar{a} is perpendicular to the plane of bˉ\bar{b} and cˉ\bar{c}. If the angle between bˉ\bar{b} and cˉ\bar{c} is π3\dfrac{\pi}{3}, then ∣aˉ+bˉ+cˉ∣=|\bar{a} + \bar{b} + \bar{c}| =

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