Unit 11 Contents

Building with Two Triangles

6. Find all the different shapes you can make by putting two triangles together edge to edge. Complete the Building with Two Triangles table in your Student Activity Book:
1. Sketch the outline of each shape in the table.
2. Count the sides, vertices, and right angles of each shape and record the numbers in the table.
3. Find all lines of symmetry for each shape. Draw them on your shape and write the number in the table. Follow the example.

7. Find and describe at least one pattern in your table.

Building with Three Triangles

8. Find all the shapes that can be made by putting three triangles together edge to edge. Complete the Building with Three Triangles table in your Student Activity Book. Follow the steps in 6A–6C.
9. Find and describe a pattern in your new table.