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NEET UG PHYSICS MCQ: MOTION IN PLANE

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Statement-I: In Δabc,ab→+bc→+ca→=0\Delta \mathrm{abc}, \overrightarrow{\mathrm{ab}}+\overrightarrow{\mathrm{bc}}+\overrightarrow{\mathrm{ca}}=0
Statements-II: If oa→=a→,ob→=b→\overrightarrow{\mathrm{oa}}=\overrightarrow{\mathrm{a}}, \overrightarrow{\mathrm{ob}}=\overrightarrow{\mathrm{b}}, then ab→=a→+b→\overrightarrow{\mathrm{ab}}=\overrightarrow{\mathrm{a}}+\overrightarrow{\mathrm{b}} (triangle law of addition)
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Correct option: B
Statement-I is true and statement-II is false
Option A is correct because the sum of the squares of the direction cosines must equal 1.

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