Euclid S Elements Part Four Book I Proposition 1

Summary

Mr Bradley's step by step board presentation of my new website: EulersAcademy.org This is the fourth If a triangle has two sides equal to two sides in another triangle, and the angle between them is also equal, then the two triangles ... A step by step board presentation of In parallelograms, the opposite sides are equal, and the opposite angles are equal. Drawing a line between opposite corners of a ... How to construct an equilateral triangle from a given line segment. Draw a given line inside a circle. If two triangles have two sides equal to two sides, respectively, and have the angle enclosed by the equal straight-lines equal, ... If the sum of the angles between three straight lines sum up to 180 degrees, then the outer two lines form a single straight line.