A circle is a closed, two-dimensional, round shape with no straight sides or vertices; its boundary is uniformly curved, with every boundary point the same distance from a center. Circles can be recognized regardless of their size, orientation, color, or surrounding context and distinguished from ovals, polygons, and three-dimensional spheres; formal measurement of radius, diameter, or circumference is not included.
A circle is a closed, round shape. It has:
A circle can be big or small, and it can be any color.
Example: Look at these shapes:
Step 1: Check each shape for straight sides and corners.
Shapes B and D have straight sides and corners, so they are not circles.
Step 2: Compare the round shapes.
Shape C is stretched longer, so it is an oval. Shape A is evenly round all the way around.
Answer: Shape A is the circle.
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