A pentagon has five sides. A decagon has ten sides. A heptagon has seven sides. A octagon has 8 sides.
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10 sides on a "decagon." deca as a prefix means 10.
Decihedron has 10 sides.
A Hendecagon has 11 sides
Scalene sides are different lengthed isosceles two of the 3 sides are the same equilateral, the three sides are the same lenght and are all at 90degrees
An isosceles triangle has 2 equal sides whereas an equilateral triangle has 3 equal sides.