What is the names of all 2d shapes?

Answer 1

line, square, circle, triangle, quadrilateral, pentagon, hexagon, heptagon, octagon, nonagon, decagon, polygon, star, rhombus, trapezoid, parallelogram

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A line is one-dimensional. And what about ellipses, ovals, a square with one side replaced by a curve, irregular shapes?

Answer 2

2d shapes can by polygons or circles or very irregular shapes, but the point is they all fit on the plane so they are called planar.