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Some two-dimensional shapes: square triangle rectangle diamond circle trapezoid
There are many examples of daily life applications of real numbers. Some of these examples include clocks and calendars.
A polygon is a two-dimensional shape enclosed by lines only, not curves. So triangles, squares, rectangles, and octagons are examples of polygons. Circles, ellipses, and annuli are some shapes that are not polygons.
Icosahedron are 3-D solid shapes with 20 triangualr faces. They are used as dice is many games, such as Dungeons & Dragons.
The difference is that two-dimensional shapes have a length and a width while three-dimensional shapes have a length, width, and depth. While some examples of two-dimensional shapes are circle, rectangle, and triangle, example of three-dimensional figures are a sphere, cuboid, and a pyramid.