Geometry Principles

A Straight line is the shortest line vetween two points

only  one straight line can be drawn between two points

Two straight lines can intersect at only one point

Quantities (line) equal to the same quantity (line) are equal to each other

The whole is greater than any of its parts

If equals are added to equals, the sums are equal

If equals are subtracted from equals, then the remainders are equal

Doubles of equals are equal

Halves of equals are equal

If the first of three quantities is grater than the second, and the second is greater than the third, then the first  is greater than the third

all strait angles are equal