# Shapes – Definition, Types, FAQs, Practice Problems, Examples

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## What are Shapes?

In geometry, a shape can be 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 the two-dimensional square, rectangle, and oval or the three-dimensional rectangular prism, cylinder, and sphere in the objects we see around us. These geometric shapes appear in objects we see as credit cards, bills and coins, finger rings, photo frames, dart boards, huts, windows, magician’s wands, tall buildings, flower pots, toy trains, and balloons.

## Different Types of Shapes

Shapes can be classified into open and closed shapes.

Closed geometric shapes can further be put into two broad categories, namely two-dimensional shapes and three-dimensional shapes.

Here’s a list of 2-D or two-dimensional shapes with their names and pictures:

Here’s a list of 3-D or three-dimensional shapes with their names and pictures:

The color, overall size, and orientation called the non-defining attributes of a two-dimensional or three-dimensional shape do not define or affect the shape in any way. These attributes can change without any effect on the shape.

On the other hand, defining attributes such as the number of sides (parallel or non-parallel, straight or curved), vertices, edges, and faces of a shape, whether the shape is open or closed, and the angle measures determine the shape of a two-dimensional or three-dimensional object. Any change in these defining attributes will change the shape.

## Solved Examples on Shapes

Example 1: Name the shapes.

1. A polygon with 6 sides.
2. Outline of a door.
3. When you fold square corner to corner.
4. A square and a triangle on top of it.

Solution:

1. Hexagon
3. Triangle
4. Pentagon

Example 2: Classify the given letters as open shape or closed shape.

C, D, L, M, O, S, U, V, Z

Solution:

Open shape: C, L, M, S, U, V, Z

Closed shape: D, O

Example 3: Identify the solid shape of given objects.

1. Globe
2. Book
3. Cold drink can
4. Dice

Solution:

1. Sphere
2. Cuboid
3. Cylinder
4. Cube

Example 4: Why is the crescent-shaped moon not a polygon?

Solution:

Crescent shape moon is not a polygon as it has curved lines.

## Practice Problems On Shapes

1

### What is 8-sided polygon known as?

hexagon
heptagon
octagon
CorrectIncorrect
A polygon with 8 sides is known as octagon.
2

### How many dimensions does a solid shape have?

1
2
3
depends on the shape
CorrectIncorrect