A shape with three sides is called a triangle. A shape with ten sides is called a decagon.
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A polygon with 10 sides is a decagon
A regular decagon has 10 equal sides.
A regular decagon
well... theres a decagon(10 sides)...
Regular = all sides equal so all sides of 25 cm. Decagon = 10 sides. So perimeter = 10*25cm = 250 cm.