A circle is a shape with no corners and no straight sides. It is perfectly round. Circles are everywhere: wheels, plates, clocks, and cookies! All points on a circle are the same distance from the center. That is what makes it perfectly round!

The circle is the round shape (⚪). Squares and rectangles have straight sides and corners. Triangles have three straight sides and three corners. Only the circle has no straight sides and no corners. Circles are special because they roll – that is why wheels are circles!

A checkerboard tile is a square because it has four sides that are all the same length and four corners. A square is a special type of rectangle where all sides are equal. Squares are everywhere: windows, picture frames, and even waffles can look like squares!

A triangle has three sides! That is where its name comes from: "tri" means three. Triangles are the only shape that cannot be pushed out of shape – they are very strong. You can find triangles in musical instruments (like a triangle instrument), in roof supports, and in slices of pizza!

A door is a rectangle because it has four sides: two long sides and two short sides. Opposite sides are equal. Rectangles are everywhere: doors, windows, sheets of paper, cell phones, and televisions. A square is a special kind of rectangle where all four sides are equal!

A rectangle has 4 corners (vertices). A rectangle has 4 sides and 4 corners. A square also has 4 sides and 4 corners. A triangle has 3 corners. A circle has 0 corners. Knowing how many sides and corners shapes have helps you tell them apart!

A baseball is a sphere! A sphere is a 3D circle – it is round in every direction. A sphere has no flat faces, no edges, and no corners. It just rolls! Other examples of spheres: planets, oranges, and bubbles. Good job learning about 3D shapes!

A checkerboard tile is a perfect square – all sides are the same length, and it has four right-angle corners. Squares are everywhere! Some other square objects: sticky notes, some picture frames, and floor tiles. A square is a very balanced and symmetrical shape.

The answer is a triangle! Triangles have three sides and three corners. The word "triangle" comes from "tri" (three) and "angle" (corner). Triangles are the strongest shape – engineers use them to build bridges, roofs, and towers because they do not bend easily!

The circle is different because it has no straight sides and no corners. Squares, rectangles, and triangles all have straight sides and corners. Circles are smooth and round. Being able to sort and classify shapes by their properties (sides, corners, curves) is an important geometry skill!