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Shape – Definition, Examples | EDU.COMEDU.COMResourcesBlogGuidePodcastPlanBackHomesvg]:size-3.5">Math Glossarysvg]:size-3.5">ShapeShape – Definition, ExamplesTable of ContentsUnderstanding Shapes in Geometry Definition of Shapes

In geometry, a shape is defined as the form of an object or its outline, outer boundary, or outer surface. Everything we see in the world around us has a shape. We can find different basic shapes such as two-dimensional squares, rectangles, and ovals or three-dimensional rectangular prisms, cylinders, and spheres in objects all around us.

Shapes can be classified into open and closed shapes. Closed geometric shapes are further categorized into two-dimensional (2D) shapes and three-dimensional (3D) shapes. Two-dimensional shapes include circles, triangles, squares, rectangles, pentagons, and more. Three-dimensional shapes include cubes, spheres, cylinders, cones, and prisms. The defining attributes of shapes include the number of sides, vertices, edges, and faces, while non-defining attributes like color, size, and orientation don't affect the shape itself.

Examples of Shapes Example 1: Naming Shapes Based on Properties Problem:

Name the shapes:

A polygon with 6 sides. Outline of a door. When you fold square corner to corner. A square and a triangle on top of it. Step-by-step solution: Step 1, For the first shape, we need to know what a polygon with 6 sides is called. A 6-sided polygon has a special name: a hexagon.

A polygon with 6 sides

Step 2, For the second shape, think about the shape of a typical door. Doors are usually shaped like rectangles. A rectangle is a type of quadrilateral (a 4-sided shape).

Outline of a door

Step 3, For the third shape, picture what happens when you fold a square from one corner to the opposite corner. This creates a triangle.

Folding square corner to corner

Step 4, For the fourth shape, we need to combine the shapes. When you place a triangle on top of a square, you create a pentagon (a 5-sided shape).

A square and a triangle on top of it

Example 2: Classifying Letters as Open or Closed Shapes Problem:

Classify the given letters as open shape or closed shape: C, D, L, M, O, S, U, V, Z

Step-by-step solution:

Step 1, Remember that an open shape has a gap or opening, while a closed shape forms a complete boundary with no openings.

Step 2, Look at each letter one by one:

C: Has an opening on the right side, so it's an open shape. D: Forms a complete boundary with no gaps, so it's a closed shape. L: Has openings at the top and right sides, so it's an open shape. M: Has openings at both sides and bottom, so it's an open shape. O: Forms a complete circle with no gaps, so it's a closed shape. S: Has openings at both ends, so it's an open shape. U: Has an opening at the top, so it's an open shape. V: Has openings at the top and sides, so it's an open shape. Z: Has openings on multiple sides, so it's an open shape.

Step 3, Group the letters:

Open shapes: C, L, M, S, U, V, Z Closed shapes: D, O Example 3: Identifying 3D Shapes of Everyday Objects Problem:

Identify the solid shape of given objects:

Globe Book Cold drink can

Identifying 3D Shapes of Everyday Objects

Step-by-step solution:

Step 1, Think about the three-dimensional shape that best matches each object.

Step 2, For a globe, what shape does it have? A globe is round and has the same distance from center to edge in all directions, so it's a sphere.

Step 3, For a book, what 3D shape does it resemble? A book has six rectangular faces — front, back, top, bottom, and two sides. This makes it a cuboid (also called a rectangular prism).

Step 4, For a cold drink can, what is its shape? It has two circular bases connected by a curved surface, making it a cylinder.

Comments(5)PPetLoverGigiNovember 5, 2025I've used this glossary page to teach shapes to my students. It's super helpful, especially the examples for 3D shapes in everyday items!

MCMs. CarterSeptember 17, 2025I’ve been using this glossary page to help my kids understand shapes better! The examples of 2D and 3D shapes in real life really clicked with them. Super helpful resource for both parents and teachers!

NNatureLover75September 10, 2025I’ve used this glossary to teach my kids about 2D and 3D shapes—it’s super clear and the examples help them relate shapes to everyday objects. Great resource for learning!

NNatureLover89August 27, 2025I’ve been using this glossary with my kids, and the simple examples of shapes really helped them understand the difference between 2D and 3D objects. Great resource for hands-on learning!

MCMs. CarterAugust 6, 2025I’ve been using this page to teach my kids about shapes, and it’s been super helpful! The examples of 3D shapes in everyday objects made it easy for them to understand. Great resource!

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