3.1 Introduction
m∠1 + m∠2 + m∠3 + m∠4 + m∠5. Start at A. Walk along AB. On reaching B, you need to turn through an angle of m∠1, to walk along BC . When you reach at C, you need to turn through an angle of m∠2 to walk along CD. You continue to move in this manner, until you return to side AB. You would have in fact made one complete turn.
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