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- Introduction to Geometrical Theorems DEMO
- Fundamental Concepts of Geometry
- Elements in proving a geometrical theorem
- Corollary and Converse of Theorem
- Supplementary Angle Theorem
- Corollary of Supplementary Angle Theorem

- Straight Angle Theorem DEMO
- Corollaries of Straight Angle Theorem
- If two lines intersect each other,than vertical angles are congruent
- SAS Theorem
- Corollary of SAS Theorem
- Angle opposite to equal sides are equal in triangle
- Corollary of Base Angle Theorem
- An exterior angle of a traingle is greater in measure than either of
- If a transversal intersects two coplanar lines
- If a transversal intersects two parallel lines
- Sum of three angles of triangle is 180 degree