Root of 6.7 on number line
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Construct a unit circle (radius = 1) centered at 2 on the number line, and a line perpendicular to the number line passing through 2. Construct the segment from 0 to one of the points where the perpendicular intersects the circle. This segment has length sqrt5. Using this segment as a radius, construct a circle with center at 0. The second circle will intersect the number line at sqrt5 (the red circle in the diagram.)
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