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If Three Points A, B, And C, Then AB + BC = AC.

Theorem 4-1.

If Two Angles And The Included Side Of One Triangle Are Congruent To Two Angles And The Included Side Of Another Triangle, Then The Two Triangles Are Congruent.

Postulate 4-1 (SSS)

If Two Sides And The Included Angle Of One Triangle Are Congruent To Two Sides And The Included Angle Of Another Triangle, Then The Two Triangles Are Congruent.

Same Side Interior Angles Theorem.

If Two Lines Are Parallel To The Same Line, Then They Are Parallel To Each Other.

The Sum Of The Measures Of The Angles Of A Triangle Is 180.

Theorem 3-9: Polygon Angle-Sum Theorem.

If A Transversal Intersects Two Parallel Lines, Then The Alternate Interior Angles Are Congruent.

If A Segment Joins The Midpoints Of Two Sides Of A Triangle, Then The Segment Is Parallel To The Third Side, And Is Half Its Length.

Theorem 5-9.

Theorem 5-11

If A Point Is On The Perpendicular Bisector Of A Segment, Then It Is Equidistant From The Endpoints Of The Segment.

The Perpendicular Bisectors Of The Sides Of A Triangle Are Concurrent At A Point Equidistant From The Vertices.

If Two Sides Of A Triangle Are Congruent, Then The Angles Opposite Those Sides Are Congruent.

If Two Planes Intersect, Then They Intersect In Exactly One Line.

If p > q And q > r Are True Statements, Then p --> r Is A True Statement.

Reflexive Property, Symmetric Property, And Transitive Property.

All Right Angles Are Congruent.

Vertical Angles Are Congruent.

If A Conditional Is True And Its Hypothesis Occurs, Then Its Conclusion Is Guarenteed. In Symbolic Form: If p --> q Is A True Statement And p Is True, Then q Is True.

Postulate 1-9.

Postulate 1-10.

Postulate 1-1.