triangles
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making an octagon using diamond shapes
They're both shapes... ;) Also: the sum of the angles that make them up fit the equation 180(x-2) where x is the number of sides. E.g. a triangle has 3 sides so the total angle sum is 180. An octagon has 5 sides so the total angle quantity is 900.
Eight triangles of equal size form a regular octagon.
Five shapes that can be constructed are octagon, hexagon, square, triangle, and rectangle.
There are hundreds of shapes; some shapes are square, triangle, circle, rectangle, oval, octagon, hexagon, pentagon, cube, cylinder, and lots of combinations of shapes that form new shapes.