Geometry study notes -The best way to handle geometry proofs and problem solving is to commit the properties of all the quadrilaterals to memory and then mark all the properties straight onto the diagram in an exam. Be on the lookout for angles of parallel lines, congruent triangles within a problem, exterior angles of a triangle and similar triangles. To prove a parallelogram, you only need to prove one of the parallelogram tests. Here’s our geometry notes for the HSC #onlinemathcourses