A Square a square Quadrilateral I think
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triangle isosceles triangle
A pentagon. If the sides and angles are equal it is a REGULAR pentagon.
A 20-sided shape is called a dodecahedron.
A Pentagon. A five sided figure is a pentagon
A 60 sided shape is called a hexaconta. The hex prefix means 6 and the conta suffix is used for polygons with 20 to 100 sides.