### Angelfish

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

### Angelfish

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

### Angelfish

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

### Angelfish

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

### Arch

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

### Arch

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

### Arch

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

### Arch

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

### Area of Parallelogram

"From Figure 4 he sees a parallelogram equal to a rectangle of the same base and altitude. Cut out and…

### Area of Trapezoid

"The student sees the trapezoid is equal in area to a rectangle whose base is the average base of the…

### Area of Trapezoid

"The student sees the trapezoid is equal in area to a rectangle whose base is the average base of the…

### Arrow Pointing Left

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

### Arrow Pointing Left

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

### Arrow Pointing Left

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

### Arrow Pointing Left

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

### Bear

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

### Bear

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

### Bear

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

### Bear

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

### Bearded Man in a Tophat

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

### Bearded Man in a Tophat

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

### Bearded Man in Tophat

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

### Bearded Man in Tophat

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

### Beta Fish

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

### Beta Fish

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

### Beta Fish

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

### Beta Fish

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

### Boat

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

### Boat

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

### Boat

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

### Boat

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

### Camel

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

### Camel

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

### Camel

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

### Camel

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

### Cat

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

### Cat

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

### Cat

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

### Cat

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

### Quadrilateral Circumscribed About a Circle

Illustration of a quadrilateral circumscribed about a circle. This could also be described as a circle…

### Circle With Inscribed and Circumscribed Quadrilaterals

Illustration showing a circle with an inscribed and circumscribed quadrilateral.

### Circle With Inscribed Quadrilateral and Triangles Formed

Illustration showing a circle with an inscribed quadrilateral and triangles formed by extended chords.

### Composite Figure

Illustration of a figure made up of 4 smaller figures (triangles).

### Circle Inside Concentric Rectangles

Illustration of a circle inside of 2 concentric rectangles whose vertices are connected by line segments.

### Cormorant

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

### Cormorant

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

### Cormorant

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

### Cormorant

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

### Cup

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

### Cup

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

### Cup

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

### Cup

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

### Dancer

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

### Dancer

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

### Dancer

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

### Dancer

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

### Parallelogram With Diagonals

Illustration of a parallelogram with diagonals AC and BD intersecting at point O.

### Diver

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

### Diver

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

### Diver

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