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How do you cut a 45 degree angle without a protractor?

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As we know that 1/2 of 90º is 45º.Draw a line segment BC of any length.Taking B as the center, construct a semicircle that bisects BC at point P.From P, construct three arcs dividing the semi-circle into 3 equal parts that are 60º each.Mark the points as x and y where the arcs bisect the semi-circle.
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