It not necessary to know their names but what's more important is knowing how to work out their properties
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It could be a trapezium, or polygons from 5 to 13 sides. It could be a trapezium, or polygons from 5 to 13 sides. It could be a trapezium, or polygons from 5 to 13 sides. It could be a trapezium, or polygons from 5 to 13 sides.
3 sides = Triangle 4 sides = Quadrilateral 5 sides = Pentagon 6 sides = Hexagon 7 sides = Heptagon 8 sides = Octagon 9 sides = Nonagon 10 sides = Decagon. 12 sides = Dodecagon any other number after these or a shape with 11 sides .. you use the number of sides and put "gon" after.. for example if you have 13 sides. you would put 13-gon
A thirteen-sided polygon is called a triskaidecagon - from the Greek "tri", meaning 3, the connector "kai" - used in names of polygons of ten sides or more, "deka", meaning 10, and "gonus", meaning angle.
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The names of common 2-dimensional geometrical shapes: No straight sides - circle (constant diameter) - ellipse, oval (varying width) Three or more straight lines (polygons) -- 3 sides -triangle 4 sides - quadrilaterals square (4 equal sides, right angles) trapezoid (4 sides with only 1 set of parallel lines) rectangle (4 sides with 2 sets of parallel lines) rhombus (4 sides, 2 parallel pair) 5 sides - pentagon 6 sides - hexagon 7 sides - heptagon (rarely septagon) 8 sides - octagon 9 sides - enneagon (classically - nonagon) 10 sides - decagon 11 sides - hendecagon (classically - undecagon) 12 sides - dodecagon (classically - duodecagon) 13 sides - tridecagon or triskaidecagon 14 sides - tetradecagon 15 sides - pentadecagon 16 sides - hexadecagon 17 sides - heptadecagon 18 sides - octadecagon 19 sides - enneadecagon (nonadecagon) 20 sides - icosagon 30 sides - tricontagon 1000 sides - chiliagon 10000 sides - myriagon 1000000 sides - megagon (see the related link for more names)