What Is a Triangle?
A triangle is a shape with three straight sides and three corners. The word triangle is connected with the number three.
This is a triangle.
Learning Objectives
- Recognise a triangle.
- Count the three sides of a triangle.
- Count the three corners.
- Identify triangle-shaped objects.
Sides and Corners
A triangle always has three sides and three corners.
3 sides + 3 corners = triangle
Triangle-Shaped Objects
Triangular shapes can be found in many places.
- A triangular road sign
- A slice of some types of food
- A triangular flag
- A set square
Comparing Shapes
The triangle has 3 sides, the square has 4 equal sides, and the circle is round without corners.
Common Mistakes
- A triangle has three sides, not four.
- A triangle has three corners.
- Do not count the inside of a triangle as another side.
Practice
1. How many sides does a triangle have?
2. How many corners does a triangle have?
3. Name one triangle-shaped object.
4. Which shape has three sides?
Try It Yourself
Draw three triangles of different sizes. Count the sides and corners of each triangle.
Quick Revision
- A triangle has 3 sides.
- A triangle has 3 corners.
- Its sides are straight.
Next Step
You now know four common shapes. Next, we will find these shapes in objects that we see in everyday life.