This activity was taken from the Noggin BuilderZ intermediate activity book
Objectives:
1. Build basic shape of triangle.
2. Explore other geometrical shapes that can be derived from basic triangles and squares.
3. Let the kids understand that many things around us have basic geometrical shapes.
4. Use imagination and creativity to design models or games derived from these basic shapes.
Start with the basic shape
if you add a triangle to the right, you get a square 
Starting with the basic shape again,
add a triangle on the top left gives you a parallelogram 
Again, start with the basic shape
adding another triangle on the bottom left you get an isosceles triangle 
adding a triangle to the right, you get a trapezoid 
from the trapezoid, add a triangle on the right for an isosceles trapezoid 
or add a triangle on the left for a rectangle 
Remember:
