Proof: Opposite sides of parallelogram congruent | Quadrilaterals | Geometry | Khan Academy
How to determine the hypotenuse, opposite, and adjacent legs of a triangle
What are opposite sides in a quadrilateral ?
Geometry 7.3d - Opposite Sides Parallel and Equal
Identifying the hypotenuse, opposite and adjacent
GCSE Maths - Alternate, Corresponding and Allied Angles - Parallel Lines Angle Rules #117
Vertical Angles and Adjacent Angles - Geometry
(I.34) Parallelogram: opposite sides and angles are congruent, Proof
Shapes (Shape It Out) | Produced by Mr. Joe
What are Adjacent Angles? | Math with Mr. J
Euclidean Geometry Grade 10: Opposite sides Parallelogram
Vertically Opposite Angles - Corbettmaths
Parallelograms - Geometry
Colin Dodds - Angle Properties (Math Song)
What are Vertical Angles? | Math with Mr. J
Geometry – Opposite sides of a Parallelogram parallel and equal - Proof – English
How to do Opposite Sides Parallelogram Proof (Geometry #120)
Property # 1 of Parallelogram - Opposite Sides of Parallelogram are Congruent
Intro to Adjacent Angles, Vertical Angles, & Linear Pairs | Geometry | Eat Pi
Math Antics - Angle Basics