Out lines or principal lines are drawn as:
AChain thin lines
BChain thick lines
CContinuous thick lines
DContinuous thin lines
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ബാഹ്യകോൺ 45° ആയ ഒരു സമബഹുഭുജത്തിന് എത്ര വശങ്ങൾ ഉണ്ട് ?
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Cos 30º =