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- Introduction to Geometrical Theorems
- Elements in proving a geometrical theorem
- Problem 1: Elements in proving a geometrical theorem

- Problem 1: Analytical and Synthesis method to Prove theorem DEMO
- Reductio-Ad-Absurdum Method
- Problem 1: Reductio-Ad-Absurdum Method
- If two lines intersect each other,than vertical angles are congruent

- Interior and exterior of triangle DEMO
- Problem 1: Interior and exterior of triangle
- Triangluar Region and Triangular Area
- Interior and exterior angles of traingle
- Included Angle and Included Side of Triangle

- Side Angle Side Postulate DEMO
- Problem 1: side angle side postulate
- An exterior angle of a traingle is greater in measure than either of
- Problem 1:An exterior angle of a traingle is greater in measure than

- Parallel Lines Postulate DEMO
- Problem 1: Parallel Lines Postulate
- If a transversal intersects two coplanar lines
- If a transversal intersects two parallel lines
- Problem 1: If a transversal intersects two parallel lines

- Trapezoid and Trapezium DEMO
- Problem 1: Trapezoid and Trapezium
- Sum of three angles of triangle is 180 degree
- Problem 1: Sum of three angles of triangle is 180 degree
- Angle opposite to equal sides are equal in triangle
- Angle-Side-Angle Postulate-1
- Side-Side-Side Postulate-3
- Sides Facing Equal Angles are Equal in Triangle-2
- Hypotenuse Side Postulate-4
- Diagonals of Parallelogram Bisects Each Other-1
- Parallelogram Opposite Sides - Congruent -Parallel-2
- Mid point Theorem-3
- All Medians of Triangle Trisect Each Other-4
- Proportional Segment Theorem-5
- Perpendicular Bisector Theorem-1
- Converse of Perpendicular Bisector Theorem-2
- Triangle Right Bisectors of Sides are Concurrent-3
- Angle Bisector Theorem-4
- Converse of Angle Bisector Theorem-5

- Longer Side Inequality Theorem-1 DEMO
- Converse of Longer Side Inequality Theorem-1a
- Problem 1: Converse of Longer Side Inequality Theorem-1a
- Triangle Sum of Two Sides is Greater Than Third-2
- Problem 2: Triangle Sum of Two Sides is Greater Than Third-3
- Shortest Distance from Point to a Line-3
- Problem 2: Shortest Distance from Point to a Line-3

- Proportional Parts of Triangle by Side Splitter Theo-1 DEMO
- Converse of Proportional Parts of Triangle -2
- Division of Opposite Side by Angle Bisector-3
- Proportional Parts of Similar Triangle-4
- Converse of Proportional parts of similar triangle