 ### Parallelogram

Parallelogram with angles labeled. ### Parallelogram

Illustration of a parallelogram, a quadrilateral which has opposite sides parallel. ### Parallelogram With Vertices Labeled

An illustration of a parallelogram with vertices labeled. ### Parallelogram

Tangrams, invented by the Chinese, are used to develop geometric thinking and spatial sense. Seven figures… ### Parallelogram

Tangrams, invented by the Chinese, are used to develop geometric thinking and spatial sense. Seven figures… ### Parallelogram

Tangrams, invented by the Chinese, are used to develop geometric thinking and spatial sense. Seven figures… ### Parallelogram

Tangrams, invented by the Chinese, are used to develop geometric thinking and spatial sense. Seven figures… ### Altitude and Diagonal of a Parallelogram

Illustration of a parallelogram with altitude and diagonal drawn. ### Area of a Parallelogram

Illustration of parallelogram AEFC drawn two different ways with base b and altitude/height a used to… ### Construction Of A Parallelogram

An illustration showing the construction used to erect a parallelogram given two sides and an angle.… ### Parallelogram Used to Construct Equivalent Square

Illustration of a how to construct a square equivalent to a given parallelogram. ### Parallelogram With Diagonals Bisecting Each Other

Illustration of a parallelogram with diagonals drawn to show they bisect each other. ### Parallelogram With Dimensions

Parallelogram with dimensions labeled. Parallelogram can be used to calculate area. ### Parallelogram With Dimensions

Parallelogram with dimensions labeled. Parallelogram can be used to calculate area. ### Parallelogram With Lines From opposite Vertices to Midpoints

Illustration to show that when lines from two opposite vertices of a parallelogram to the midpoints… ### Parallelogram and Rectangle Relationship

Parallelogram with dimensions drawn to show relationship to the area of a rectangle. ### 2 Equal Parallelograms

Illustration used to prove the theorem "Two parallelograms are equal if two sides and the included angle… ### Equal Parallelograms

Illustration of a two equal parallelograms. Two parallelograms are equal, if two sides and the included… ### Parrot Fish

Tangrams, invented by the Chinese, are used to develop geometric thinking and spatial sense. Seven figures… ### Parrot Fish

Tangrams, invented by the Chinese, are used to develop geometric thinking and spatial sense. Seven figures… ### Parrot Fish

Tangrams, invented by the Chinese, are used to develop geometric thinking and spatial sense. Seven figures… ### Parrot Fish

Tangrams, invented by the Chinese, are used to develop geometric thinking and spatial sense. Seven figures… Illustration to show that if the diagonals of a quadrilateral bisect each other, the figure is a parallelogram. ### Quadrilaterals With Lines Joining Midpoints

Illustrations to show quadrilaterals with lines joining the midpoints of the sides of any quadrilateral,… ### Rabbit Lieing Down

Tangrams, invented by the Chinese, are used to develop geometric thinking and spatial sense. Seven figures… ### Rabbit Lieing Down

Tangrams, invented by the Chinese, are used to develop geometric thinking and spatial sense. Seven figures… ### Rabbit Lying Down

Tangrams, invented by the Chinese, are used to develop geometric thinking and spatial sense. Seven figures… ### Rabbit Lying Down

Tangrams, invented by the Chinese, are used to develop geometric thinking and spatial sense. Seven figures… ### Rabbit Siting on Its Hind Legs

Tangrams, invented by the Chinese, are used to develop geometric thinking and spatial sense. Seven figures… ### Rabbit Siting on Its Hind Legs

Tangrams, invented by the Chinese, are used to develop geometric thinking and spatial sense. Seven figures… ### Rabbit Siting on Its Hind Legs

Tangrams, invented by the Chinese, are used to develop geometric thinking and spatial sense. Seven figures… ### Rabbit Siting on Its Hind Legs

Tangrams, invented by the Chinese, are used to develop geometric thinking and spatial sense. Seven figures… ### Reclining Man Facing Left

Tangrams, invented by the Chinese, are used to develop geometric thinking and spatial sense. Seven figures… ### Reclining Man Facing Left

Tangrams, invented by the Chinese, are used to develop geometric thinking and spatial sense. Seven figures… ### Reclining Man Facing Left

Tangrams, invented by the Chinese, are used to develop geometric thinking and spatial sense. Seven figures… ### Reclining Man Facing Left

Tangrams, invented by the Chinese, are used to develop geometric thinking and spatial sense. Seven figures… ### Reclining Man Facing Right

Tangrams, invented by the Chinese, are used to develop geometric thinking and spatial sense. Seven figures… ### Reclining Man Facing Right

Tangrams, invented by the Chinese, are used to develop geometric thinking and spatial sense. Seven figures… ### Reclining Man Facing Right

Tangrams, invented by the Chinese, are used to develop geometric thinking and spatial sense. Seven figures… ### Reclining Man Facing Right

Tangrams, invented by the Chinese, are used to develop geometric thinking and spatial sense. Seven figures… ### Rectangle

Rectangle with angles labeled. Parallelogram with right angles. ### Rectangle

Illustration of a rectangle, which is a parallelogram with all angles right angles. ### Rectangle

Tangrams, invented by the Chinese, are used to develop geometric thinking and spatial sense. Seven figures… ### Rectangle

Tangrams, invented by the Chinese, are used to develop geometric thinking and spatial sense. Seven figures… ### Rectangle

Tangrams, invented by the Chinese, are used to develop geometric thinking and spatial sense. Seven figures… ### Rectangle

Tangrams, invented by the Chinese, are used to develop geometric thinking and spatial sense. Seven figures… ### Rectangle With Diagonals

Illustration to show that if the diagonals of a parallelogram are equal, the figure is a rectangle. ### Rhomboid

Illustration of a rhomboid, which is a parallelogram which has its angles oblique angles. ### Rhombus

Illustration of a rhombus, which is a rhomboid with all sides equal. ### Rhombus

Tangrams, invented by the Chinese, are used to develop geometric thinking and spatial sense. Seven figures… ### Rhombus

Tangrams, invented by the Chinese, are used to develop geometric thinking and spatial sense. Seven figures… ### Rhombus

Tangrams, invented by the Chinese, are used to develop geometric thinking and spatial sense. Seven figures… ### Rhombus

Tangrams, invented by the Chinese, are used to develop geometric thinking and spatial sense. Seven figures… ### Right Triangle

Tangrams, invented by the Chinese, are used to develop geometric thinking and spatial sense. Seven figures… ### Right Triangle

Tangrams, invented by the Chinese, are used to develop geometric thinking and spatial sense. Seven figures… ### Right Triangle

Tangrams, invented by the Chinese, are used to develop geometric thinking and spatial sense. Seven figures… ### Right Triangle

Tangrams, invented by the Chinese, are used to develop geometric thinking and spatial sense. Seven figures… ### Rooster

Tangrams, invented by the Chinese, are used to develop geometric thinking and spatial sense. Seven figures… ### Rooster

Tangrams, invented by the Chinese, are used to develop geometric thinking and spatial sense. Seven figures… ### Rooster

Tangrams, invented by the Chinese, are used to develop geometric thinking and spatial sense. Seven figures…