Parallel straight lines are straight lines which, being in the same plane and being produced indefinitely in both directions, do not meet one another in either direction.
Father of geometry
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"Give him threepence, since he must make a gain out of what he learns."
Shocking"Let it be granted that all right angles are equal to one another."
Strange & Unusual"A number is a multitude composed of units."
Strange & Unusual"Of trilateral figures, an equilateral triangle is that which has its three sides equal, an isosceles triangle that which has only two of its sides equal, and a scalene triangle that which has its thre…"
Shocking"If a straight line touch a circle, and from the point of contact there be drawn across in the circle a straight line cutting the circle, the angles which it makes with the tangent will be equal to the…"
Strange & Unusual