What is a Corner (of a Shape)?

S0-SA2-0863

Grade Level:

Pre-School – Class 2

All domains without exception

Definition

What is it?

A corner of a shape is the point where two or more sides or edges meet. It's like the pointy part where lines come together. We also call a corner a 'vertex' (plural: vertices).

Simple Example

Quick Example

Imagine your school textbook. The place where the front cover meets the spine, and the top edge meets the side edge, that's a corner! Each page also has four corners where its edges meet.

Worked Example

Step-by-Step

Let's find the corners of a simple square like a carrom board.

1. Look at the carrom board. It has four straight sides.
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2. Find where the top side meets the left side. This is one corner.
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3. Find where the top side meets the right side. This is another corner.
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4. Find where the bottom side meets the left side. This is a third corner.
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5. Find where the bottom side meets the right side. This is the fourth corner.
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ANSWER: A carrom board (square shape) has 4 corners.

Why It Matters

Understanding corners is fundamental for geometry and drawing shapes accurately. Architects use this knowledge to design buildings, and engineers use it to build structures like bridges. Even graphic designers creating logos need to understand how corners define a shape.

Common Mistakes

MISTAKE: Thinking a curved edge meeting another curved edge makes a corner. | CORRECTION: Corners are formed by straight lines (or edges) meeting at a point. A circle has no corners.

MISTAKE: Confusing a side/edge with a corner. | CORRECTION: A side is a line segment, while a corner is a single point where two sides meet.

MISTAKE: Counting the entire region around where lines meet as a corner. | CORRECTION: The corner is the exact point of intersection, not the area around it.

Practice Questions

Try It Yourself

QUESTION: How many corners does a standard mobile phone (rectangular shape) have? | ANSWER: 4

QUESTION: A triangular 'samosa' has how many corners? | ANSWER: 3

QUESTION: If you look at a dice (a cube shape), how many corners can you count in total? | ANSWER: 8

MCQ

Quick Quiz

Which of these objects has exactly 5 corners?

A cricket pitch

A five-rupee coin

A traffic sign for 'Stop' (octagon shape)

A pencil box (cuboid shape)

The Correct Answer Is:

A cricket pitch is rectangular (4 corners). A five-rupee coin is circular (0 corners). A pencil box is a cuboid (8 corners). A 'Stop' sign is an octagon, which has 8 corners, not 5. (Wait, the question asks for 5 corners, and the options don't match for a regular shape. Let me correct the MCQ option to fit a pentagon or similar.)

Corrected MCQ option for 5 corners:
Which of these shapes has exactly 5 corners?
A) Rectangle
B) Circle
C) Pentagon
D) Triangle

Correct Answer: C. A pentagon is a shape with five straight sides and five corners. A rectangle has 4, a circle has 0, and a triangle has 3.

Real World Connection

In the Real World

When you look at the design of buildings in your city, like a new mall or an apartment complex, notice how the walls meet. Each point where two walls come together forms a corner. These corners are crucial for the stability and structure of the building, just like the corners of your study table.

Key Vocabulary

Key Terms

CORNER: The point where two or more sides meet | VERTEX: Another name for a corner | SIDE: A line segment that forms part of a shape | EDGE: Similar to a side, often used for 3D shapes

What's Next

What to Learn Next

Now that you know what a corner is, you can move on to understanding 'sides' and 'faces' of shapes. These concepts build on each other to help you describe and understand all kinds of 2D and 3D geometric figures.