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Triangles are the strongest structure in the world - most bridges etc include triangular metal parts to strengthen the bridge. I reccommend that you somehow create many triangles and support your textbook on top of these triangles.
two right triangles
They are Similar triangles if they have the same angles. it they are exactily the same they are Equaltrial.
if you need to know how many triangles are in a polygon ... just take the number of its sides and subtract for example. nonagon has 9 sides so it will be 9-2=7 so, a nonagon has 7 triangles