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If the three sides of one triangle are congruent to the three sides of another triangle, then the two triangles are congruent.

The sum of the measures of of the angles of a triangle is 180.

The sum of the measures of the angles of an n-gon is (n-2) 180.

The sum of the lengths of any two sides of a triangle is greater than the length of the third side.

If a segment joins the midpoint of two sides of a triangle, then the segment is parallel to the third side, and is half its length.

If a point is on the perpendicular bisector of a segment, then it is equdistant from the endpoints of the segment.

If three points A,B and C are collinear and B is between A and C, then AB+BC=AC

If two lines and a transversal from corresponding angles that are congruent, then the two lines are parallel.

If a transversal intersects two parallel lines, then corresponding angles are congruent.

If two angles are complements of the same angle(or of congruent angles), then the two angles are congruent.

If two sides of a triangle are congruent, then the angles opposite those sides are congruent.

If the hypotenuse and a leg of one right triangle are congruent to the hypotenuse and a leg of another right triangle, then the triangles are congruent.

If a conditional is true and its hypothesis occurs, its conclusion is guarenteed. In symbolic form: If p-->q is a true statement and p is true, then q is true.

If a transversal intersects two parallel lines, then alternate interior angles are supplementary.

The measure of each exterior angle of a triangle equals the sum of the measure of its two remote interior angles.

Vertical angles are congruent.

If a point is on the bisector of an angle, then the point is equidistant from the sides of the angle.

If p>q ad q>r are true statements, then p-->r is a true statement.

Define CPCTC.

Angles of a polygon that share a side.