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What solid shape can be made with 2 circles and 1 large triangle?
Cylinder
Why is a triangle the strongest polygon?
because you can't just change one of the angles or one of the side lengths without breaking the triangle. All the angles and sides re-inforce each other. Image a square made out of sticks that are attached loosely at the corners. You can squish two of the corners together to make a diamond shape, and you haven't changed the length of the sides. But if you have a triangle made out of sticks, you can't change it's shape without destroying it.
What shape made out of straight pieces is strongest or most rigid?
The most rigid shape that you can make out of straight pieces is the triangle.
What three shapes made from straws would be rigid?
triangle , square , rectangle
Can a hexagon and a square be made to tessellate?
No. Hexagons and squares will each tessellate by themselves but one can not make a tessellation out of hexagons and squares combined. However, if you add in a third shape, the triangle, one can make a tessellation.
