$To construct an angle of 210 °, which set square must be put into use to draw the angle using least possible lines ? Also find the number of lines .$

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Solution

$210 ° = (90 ° + 90 ° + 30 °) or (60 ° + 60 ° + 90 °) Therefore 90 ° - 60 ° - 30 ° set square should be used to draw 210 ° with least possible steps . Number of lines = 4 (including arms of the required angle)$

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