# All About Shapes - What is a Circle?

Circles are one of the first shapes kids recognize. A circle is a closed, two-dimensional shape that has no corners. 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 of circle, triangle, square, and rectangle. At 3 years old, most kids have some familiarity with the concept of circles.

This worksheet is all about circles. It is a great tool for kids to learn about what are circles and how to recognize circles. A circle is a 2D shape in which all the points along the edge are the same distance from the center. It is perfectly rounded, and it has no straight sides and no corners. Circles are all around us. The worksheet shows pictures of several common objects that have circle shapes, including a dartboard, a wheel, a wall clock, a coin, a traffic sign of railroad crossing, the Olympic symbol of five rings, and a watch. Circles can be big or little, and can be any color: green, blue, red, or purple. A simple exercise is given for kids to recognize circles from other shapes that may look like circles.

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