# Category:Parallelograms

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This category contains results about Parallelograms.

Definitions specific to this category can be found in Definitions/Parallelograms.

A **parallelogram** is a quadrilateral whose opposite sides are parallel to each other, and whose sides *may or may not* all be the same length.

## Subcategories

This category has the following 4 subcategories, out of 4 total.

### C

### D

### R

### S

## Pages in category "Parallelograms"

The following 37 pages are in this category, out of 37 total.

### A

### C

- Complements of Parallelograms are Equal
- Condition for Points in Complex Plane to form Parallelogram
- Construction of Parallelogram Equal to Given Figure Exceeding a Parallelogram
- Construction of Parallelogram Equal to Given Figure Less a Parallelogram
- Construction of Parallelogram equal to Triangle in Given Angle
- Construction of Parallelogram in Given Angle equal to Given Polygon
- Construction of Parallelogram on Given Line equal to Triangle in Given Angle

### D

### P

- Parallelogram on Same Base as Triangle has Twice its Area
- Parallelogram Similar and in Same Angle has Same Diameter
- Parallelograms About Diameter are Similar
- Parallelograms are Congruent if Two Adjacent Sides and Included Angle are respectively Equal
- Parallelograms with Equal Base and Same Height have Equal Area
- Parallelograms with Same Base and Same Height have Equal Area
- Perimeter of Parallelogram
- Pythagoras's Theorem for Parallelograms

### Q

- Quadrilateral is Parallelogram iff Both Pairs of Opposite Angles are Equal
- Quadrilateral is Parallelogram iff Both Pairs of Opposite Sides are Equal or Parallel
- Quadrilateral is Parallelogram iff Diagonals Bisect each other
- Quadrilateral is Parallelogram iff One Pair of Opposite Sides is Equal and Parallel
- Quadrilateral with Bisecting Diagonals is Parallelogram