# Transformations using GEOBOARDS: Translations, reflections and rotations.

### In this activity you need to be provided with 4 geoboards and sufficient number of rubber bands to build triangles using the pins on the boards. You will also use some of the rubber bands to join the four geoboards to make a coordinate plane. A worksheet me be generated with the corresponding transformations so that the first attempt be done using the transformations rules in the coordinate plane. Then the students are supposed to repeat it hands on the geoboards..

Lesson's Content

Lesson's Glossary

Angle
Geometry shape formed by two rays (initial and ending sides of the angle) that share a common endpoint called the vertex. You may name an angle using the vertex, or a point in each ray and the vertex label in the center.

Concave polygon
If a polygon has diagonals that lie outside the polygon then the polygon is concave.

Convex polygon
A convex polygon is any polygon that is not concave.

Decagon
A ten-sided polygon.

Dodecagon
A twelve-sided polygon.

Heptagon
A seven-sided polygon.

Hexagon
A six-sided polygon.

irregular polygon
An irregular polygon is any polygon that is not regular.

N-gon
A polygon with n sides.

Nonagon
A nine-sided polygon.

Octagon
An eight-sided polygon.

A 15-sided polygon.

Pentagon
A five-sided polygon.

Polygon
A polygon is a two-dimensional geometric figure with these characteristics: •
It is made of straight line segments.
Each segment touches exactly two other segments, one at each of its endpoints.
It is closed -- it divides the plane into two distinct regions, one inside and the other outside the polygon.

Regular polygon
A regular polygon has sides that are all the same length and angles that are all the same size.