Using these two rules it's possible to prove that angles in a triangle add up to 180 Back to the bridge. To start, draw two parallel lines. One that follows an edge of the triangle and one through ...

You'll like draw a perfect square or rectangle by drawing congruent angles to form the box, and then congruent triangles (equilateral ... is used in reference to parallel lines: Two parallel ...

If the triangles are congruent and each geometric ... This example occurs when two parallel lines are intersected by a third straight line. With both parallel lines cut, the adjacent angles ...