# Uses of Geoboards

Note that Geoboards can be used for most lessons involving polygons, straight lines, and integer coordinates. However, a Geoboard can only represent line segments, and thus, a lesson involving points, such as plotting coordinates in the first quadrant, can't be done using a Geoboard.

## Square Geoboards

- Area and perimeter of a rectangle
- Area and perimeter of a composite rectangle
- Proof: Area of a rhombus
- Naming concave and convex polygons
- At this time, Feb 8, 2022, no English YouTube video exists on this topic.

- Naming and building polygons (triangle, quadrilateral, pentagon, etc.)
- Classifying triangles
- Naming and building quadrilaterals
- At this time, Feb 8, 2022, no good YouTube video exists on this topic.

- Slope
- At this time, Feb 8, 2022, no YouTube video exists on this topic.

- Parallel and perpendicular lines on the coordinate plane
- At this time, Feb 8, 2022, no YouTube video exists on this topic.

- Area of a triangle given the coordinates of its vertices
- At this time, Feb 8, 2022, no YouTube video exists on this topic.

- Lots of geometry explorations involve the Geoboard, such as those provided by NRICH

## Circular geoboards

- Thales's theorem