Below are the tutorials on quadrilaterals. All links point videos on the Sipnayan Youtube channel.
Lesson 1: Basic Terminologies about Quadrilaterals
Lesson 2: Sum of the Interior Angles of Quadrilateral
Lesson 3: Definition of Parallelogram and Its Properties
Lesson 4: Proof that Opposite Sides of a Parallelogram are Congruent
Lesson 5: Proof that Opposite Angles of Parallelogram Are Congruent
Lesson 6: Proof that Diagonals of Parallelograms Divide it to Congruent Triangles
Lesson 7: Proof that Diagonals of a Parallelogram Bisect Each Other
Lesson 8: Proof that if Opposite Sides of a Quadrilateral are Congruent It is a Parallelogram
Lesson 9: Proof that if Opposite Angles of a Quadrilateral are Congruent It is a Parallelogram
Lesson 10: If the diagonals of a quadrilateral bisect each other, it is a parallelogram
Lesson 11: If one pair of sides of a quadrilateral are both congruent and parallel, it is a parallelogram
Lesson 12: Definitions of Rectangles, Rhombuses, and Squares
Lesson 13: Diagonals of a Rectangle are Congruent
Lesson 14: Diagonals of a Rhombus are Perpendicular
Lesson 15: Definition and Parts of a Trapezoid
Lesson 16: Base Angles of Isosceles Trapezoid are Congruent
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