Demonstrative Geometry

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Chapter 12: Demonstrative Geometry (87 videos)   (Practice Test)
12.1: Theorems on Lines & Polygons
  1. Elements in proving a geometrical theorem
12.2: Methods of Proof
  1. Problem 1: Analytical and Synthesis method to Prove theorem
  2. Problem 1: Reductio-Ad-Absurdum Method
  3. If two lines intersect each other,than vertical angles are congruent
12.3: Triangle  (Practice Test)
  1. Interior and exterior of triangle
  2. Problem 1: Interior and exterior of triangle
  3. Triangluar Region and Triangular Area
  4. Interior and exterior angles of traingle
  5. Problem 1: Interior and exterior angles of traingle
  6. Included Angle and Included Side of Triangle
  7. Problem 1: Included Angle and Included Side of Triangle
12.4: Kinds of Triangle
  1. Kinds of Triangle
  2. Problem 1: Kinds of Triangle
12.5: One-One Correspondence between Two Triangles & Other Polygons
  1. Congruence of Other Polygons
12.6: Congruence of Triangles
  1. Congruency of Triangles
  2. Problem 1: Congruency of Triangles
12.7: Congruence of Other Polygons
  1. Congruence of Other Polygons
  2. Problem 1: Congruence of Polygons
12.8: Postulate 14- Side Angle Side Postulate ( S.A.S Postulate )  (Practice Test)
  1. Side Angle Side Postulate
  2. Problem 1: side angle side postulate
  3. An exterior angle of a traingle is greater in measure than either of
  4. Problem 1:An exterior angle of a traingle is greater in measure than
12.9: Transversal, Interior & Exterior Angles
  1. Transversal, Interior and Exterior Angles
  2. Problem 1: Transversal, Interior and Exterior Angles
12.10: Alternate Interior Angles
  1. Alternate and corresponding Angles
  2. Problem 1: Alternate and corresponding Angles
12.11: Corresponding Angles
  1. Alternate and corresponding Angles
  2. Problem 1: Alternate and corresponding Angles
12.12: Parallel Lines
  1. Parallel Lines
  2. Problem 1: Parallel Lines
12.13: Postulate 15. Parallel Lines Postulate  (Practice Test)
  1. Parallel Lines Postulate
  2. Problem 1: Parallel Lines Postulate
  3. If a transversal intersects two coplanar lines
  4. If a transversal intersects two parallel lines
  5. Problem 1: If a transversal intersects two parallel lines
12.14: Parallelogram
  1. Kinds of Parallelogram
  2. Problem 1: Kinds of Parallelogram
12.15: Trapezoid & Trapezium  (Practice Test)
  1. Trapezoid and Trapezium
  2. Problem 1: Trapezoid and Trapezium
  3. Sum of three angles of triangle is 180 degree
  4. Problem 1: Sum of three angles of triangle is 180 degree
  5. Angle opposite to equal sides are equal in triangle
  6. Problem 1: Angle opposite to equal sides are equal in triangle
  7. Angle-Side-Angle Postulate-1
  8. Problem 1: Angle-Side-Angle Postulate-1
  9. Side-Side-Side Postulate-3
  10. Problem 1: Side-Side-Side Postulate-3
  11. Sides Facing Equal Angles are Equal in Triangle-2
  12. Problem 1: Sides Facing Equal Angles are Equal in Triangle-2
  13. Hypotenuse Side Postulate-4
  14. Problem 1: Hypotenuse Side Postulate-4
  15. Diagonals of Parallelogram Bisects Each Other-1
  16. Problem 1: Diagonals of Parallelogram Bisects Each Other-1
  17. Problem 2: Diagonals of Parallelogram Bisects Each Other-1
  18. Parallelogram Opposite Sides - Congruent -Parallel-2
  19. Mid point Theorem-3
  20. Problem 2: Mid point Theorem-3
  21. Problem 1: Mid point Theorem-3
  22. All Medians of Triangle Trisect Each Other-4
  23. Problem 1: All Medians of Triangle Trisect Each Other-4
  24. Proportional Segment Theorem-5
  25. Perpendicular Bisector Theorem-1
  26. Converse of Perpendicular Bisector Theorem-2
  27. Triangle Right Bisectors of Sides are Concurrent-3
  28. Problem 1: Triangle Right Bisectors of Sides are Concurrent-3
  29. Problem 2: Triangle Right Bisectors of Sides are Concurrent-3
  30. Angle Bisector Theorem-4
  31. Converse of Angle Bisector Theorem-5
12.16: Theorems on Inequalities  (Practice Test)
  1. Longer Side Inequality Theorem-1
  2. Converse of Longer Side Inequality Theorem-1a
  3. Problem 1: Converse of Longer Side Inequality Theorem-1a
  4. Problem 2: Converse of Longer Side Inequality Theorem-1a
  5. Triangle Sum of Two Sides is Greater Than Third-2
  6. Problem 2: Triangle Sum of Two Sides is Greater Than Third-3
  7. Shortest Distance from Point to a Line-3
  8. Problem 2: Shortest Distance from Point to a Line-3
  9. Problem 1: Shortest Distance from Point to a Line-3
12.17: Similar Figures  (Practice Test)
  1. Proportional Parts of Triangle by Side Splitter Theo-1
  2. Converse of Proportional Parts of Triangle -2
  3. Division of Opposite Side by Angle Bisector-3
  4. Proportional Parts of Similar Triangle-4
  5. Converse of Proportional parts of similar triangle
12.18: Pythagoras Theorem  (Practice Test)
  1. Pythagoras Theorem-1
  2. Problem 1: Pythagoras Theorem-1
  3. Problem 2: Pythagoras Theorem-1
  4. Converse of Pythagoras Theorem-2
  5. Problem 1: Converse of Pythagoras Theorem-2