geom y2 2d properties

What you'll learn

1. 1

   We describe 2D shapes by their sides and their corners. A corner is called a vertex.

2. 2

   Triangle: 3 sides, 3 corners. Square and rectangle: 4 and 4. Pentagon: 5. Hexagon: 6. Octagon: 8.

3. 3

   How many corners does a pentagon have?

4. 4

   Turning a shape does not change its name. A square standing on its corner is still a square.

5. 5

   A square and a rectangle both have 4 sides and 4 right-angle corners. The square is the one where all four sides are the same length.

6. 6

   Which shape has 3 sides?

7. 7

   What makes a square different from a rectangle?