The circle - the rest are polygons.
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No. A triangle, like a circle, square, parallelogram, or trapezoid are all constructs upon a single 2-dimensional plane.
There are lot of shapes in geometry. It is called polygons. Triangle, trapezoid, circle, parallelogram, rhombus, rectangle, diagonal, square etc. Parallelogram, rhombus, rectangle, diagonal, square, and trapezoid are quadrilaterals.
Circle. Square. Triangle was created on 2005-10-24.
Polygon Regular polygon Vertex Triangle Equilateral triangle Isosceles triangle Scalene triangle Acute triangle Obtuse triangle Right triangle Quadrilateral Rectangle Square Parallelogram Rhombus Trapezoid Pentagon Hexagon Heptagon Octagon Nonagon Decagon Circle Convex
Square - 1 face Circle - 1 face Triangle - 1 face