# All About Shapes - What is a Triangle?

Triangle is one of the most basic two-dimensional shapes in geometry. A triangle has three straight sides and three corners. It is a polygon with the least possible number of sides. At around 18 months old, kids start to notice differences between shapes, and at 2 years old, they begin to understand, recognize and name basic shapes such as circle, triangle, square, and rectangle.

This worksheet introduces triangles. It can be used to help kids learn about what are triangles and how to recognize triangles. Triangles are closed shapes with three sides and three corners. Triangles are everywhere, and they can be found in many common objects, such as triangle musical instruments, yield signs, sails on sailing boats, banner flags, and set squares. You can also get two triangles by cutting a square or a rectangle in half. Triangles can be big or little, and can be any color: green, blue, red, or pink. Parents could help kids improve their geometry knowledge with the interesting facts of triangles provided in this worksheet.

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