Types of quadrilaterals | Elementary shapes

Parallelogram

In Euclidean geometry, a parallelogram is a simple (non-self-intersecting) quadrilateral with two pairs of parallel sides. The opposite or facing sides of a parallelogram are of equal length and the opposite angles of a parallelogram are of equal measure. The congruence of opposite sides and opposite angles is a direct consequence of the Euclidean parallel postulate and neither condition can be proven without appealing to the Euclidean parallel postulate or one of its equivalent formulations. By comparison, a quadrilateral with just one pair of parallel sides is a trapezoid in American English or a trapezium in British English. The three-dimensional counterpart of a parallelogram is a parallelepiped. The etymology (in Greek παραλληλ-όγραμμον, parallēl-ógrammon, a shape "of parallel lines") reflects the definition. (Wikipedia).

Parallelogram
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Using the properties of parallelograms to solve for the missing diagonals

👉 Learn how to solve problems with parallelograms. A parallelogram is a four-sided shape (quadrilateral) such that each pair of opposite sides are parallel and are equal. Some of the properties of parallelograms are: each pair of opposite sides are equal, each pair of opposite sides are pa

From playlist Properties of Parallelograms

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What are the properties that make up a parallelogram

👉 Learn how to solve problems with parallelograms. A parallelogram is a four-sided shape (quadrilateral) such that each pair of opposite sides are parallel and are equal. Some of the properties of parallelograms are: each pair of opposite sides are equal, each pair of opposite sides are pa

From playlist Properties of Parallelograms

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Properties of Parallelograms

I introduce the Properties of Parallelograms...the opposite sides are equal, the opposite angles are equal, the consecutive angles are supplementary, and the diagonals bisect each other. I work through four algebraic examples in this video at 4:28 14:30 Find free review test, useful notes

From playlist Geometry

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Parallelograms - Geometry

This geometry video tutorial provides a basic introduction into parallelograms. It explains the properties of parallelograms and how to use it calculate the missing sides and missing angles of parallelograms. It contains plenty of examples and practice problems for you to work on. Oppo

From playlist Geometry Video Playlist

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From playlist Parallel Lines and a Transversal

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From playlist Parallel Lines and a Transversal

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From playlist Parallel Lines and a Transversal

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From playlist Parallel Lines and a Transversal

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From playlist Illustrative Mathematics Grade 6 Unit 1

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From playlist Geometry

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From playlist Illustrative Mathematics Grade 6 Unit 1

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From playlist Geometry

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From playlist Illustrative Mathematics Grade 6 Unit 1

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From playlist Geometry Video Playlist

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From playlist Parallel Lines and a Transversal

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Converse (logic) | Congruence (geometry) | Euclidean geometry | If and only if | Rhombus | Antiparallelogram | Right triangle | Ellipse | Convex polygon | Face (geometry) | Automedian triangle | Parallel (geometry) | Concurrent lines | Bravais lattice | Trapezoid | Quadrilateral | Conjugate diameters | Diagonal | Median (geometry) | Rotational symmetry | Rectangle | Parallel postulate | Simple polygon | Square | Point reflection | Affine transformation | Heron's formula | Parallelepiped | List of planar symmetry groups | List of self-intersecting polygons | Midpoint | Rhomboid | Parallelogram law | Viviani's theorem | Area | Square number | Levi-Civita parallelogramoid | Concave polygon | Triangle | Centroid