To draw parallel and perpendicular lines, __________ is used.
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A protractor is an instrument to measure angles with the unit degree. The set squares are a type of drawing instrument whose two edges are perpendicular to each other. There are two types of set squares. The smaller one is 45∘−45∘ set square whose edges of equal length and both the acute angles are of measure 45∘.
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straight lines is correct answer
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