Notes

There are three undefined terms in geometry. The undefined terms are point, line, and plane. A defined term is a term that has a definition. Undefined and defined relate because undefined terms can be used as foundational elements in defining other defined terms. An example of an undefined is division by zero because the denominator will always be zero. An example of a defined term is parrallel lines, because they're two coplanae lines that do not intersect. There are 3 theorems in geometry. Theorem 1 is vertical angles are equal. Theorem 2 in any triangle is any triangle the sum of two interior angles is less than two right angles. Theorem 3 if two lines are intersected by a transversal and if alternate angles are equal then its parrallel. A postulate is a statement which is also an axiom which means to be true without proof. A postulate and a theorem relate because  a theorem can be proved true by using a postulate. A construction means to draw shapes, angles or lines precisely. You only use a compass, ruler, and a pencil when you do constructions.