Practically its possible to construct length, angles and all the basic geometric shapes using compass and ruler alone. This is called as Compass - Ruler construction.
Five basic figures that can be constructed with the compass and ruler are
Creating a line with two distinct points.
Creating the circle through one point with centre another point
Creating the point which is the intersection of two existing, non-parallel lines
Creating the one or two points in the intersection of a line and a circle (if they intersect)
Creating the one or two points in the intersection of two circles (if they intersect).
For example, just with two distinct points its easy to draw a line or two circles (keeping one point as center, draw a circle and keeping other point as center draw the other circle, in the way that both the circle intersect each other.
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Daily Maths Topic Today - geometric construction using compass and ruler alone.