Triangle Shape
A triangle is a flat shape with 3 sides and 3 corners. The word 'tri' means three, so a triangle is a shape with three angles.
Triangles are all around us. A samosa, a slice of pizza, a roof top, and a traffic yield sign are all shaped like triangles. In Class 1, children learn to spot and draw triangles.
What is Triangle Shape - Class 1 Maths (Shapes and Space)?
A triangle is a flat shape (2D shape) made of 3 straight sides and 3 corners (also called vertices). It is the shape with the fewest sides among all flat shapes with straight edges.
| Feature | Triangle |
|---|---|
| Sides | 3 |
| Corners | 3 |
| Straight or curved? | All sides are straight |
Solved Examples
Example 1: Example 1: Count the Sides
Question: How many sides does a triangle have?
Answer: A triangle has 3 sides.
Example 2: Example 2: Spot the Triangle
Question: Aman looks at a samosa. What shape is it?
Think:
- A samosa has 3 sides and 3 corners
Answer: A samosa is shaped like a triangle.
Example 3: Example 3: Triangle or Not?
Question: Is a circle a triangle?
Think:
- A circle is round with 0 sides
- A triangle has 3 straight sides
Answer: No, a circle is not a triangle.
Example 4: Example 4: Corners in a Triangle
Question: How many corners does a triangle have?
Answer: A triangle has 3 corners.
Example 5: Example 5: Compare Triangle and Square
Question: Which has more sides — a triangle or a square?
Think:
- Triangle → 3 sides
- Square → 4 sides
Answer: A square has more sides (4 > 3).
Example 6: Example 6: Make a Triangle
Question: Priya has 3 sticks. Can she make a triangle?
Think:
- A triangle needs exactly 3 sides
- 3 sticks can form 3 sides
Answer: Yes, Priya can join the 3 sticks end to end to make a triangle.
Example 7: Example 7: Triangles Around Us
Question: Name 3 things shaped like a triangle.
Answer: A samosa, a slice of watermelon, and a traffic yield sign.
Key Points to Remember
- A triangle has 3 straight sides and 3 corners.
- It is the flat shape with the fewest straight sides.
- The word 'tri' means three.
- Triangles cannot roll because they have corners and flat sides.
- Samosas, pizza slices, and traffic signs are shaped like triangles.
Practice Problems
- How many corners does a triangle have?
- Draw a triangle using a ruler. Count its sides.
- Name 2 things in your kitchen that look like a triangle.
- Which has fewer sides — a triangle or a rectangle?
- Kavi makes a shape with 3 matchsticks. What shape did he make?
- Can a triangle roll like a circle? Why or why not?
Frequently Asked Questions
Q1. What is a triangle?
A triangle is a flat shape with 3 straight sides and 3 corners. It is the simplest shape made with straight lines.
Q2. How many sides does a triangle have?
A triangle has exactly 3 sides. All 3 sides are straight lines.
Q3. Why is it called a triangle?
The word 'tri' means three and 'angle' means corner. A triangle has 3 angles (corners), so it is called a tri-angle.
Q4. Can all triangles look the same?
No. Triangles can be tall, flat, or tilted. Some have all sides equal, and some have different-length sides. But all triangles have exactly 3 sides and 3 corners.
Q5. Where do we find triangles in real life?
Triangles appear in samosas, pizza slices, roof tops, traffic signs, sandwich halves cut diagonally, and the sails of a boat.
Q6. What is the difference between a triangle and a square?
A triangle has 3 sides and 3 corners. A square has 4 sides and 4 corners. A square has one more side and one more corner than a triangle.
Q7. Can I make a triangle with 2 sticks?
No. You need at least 3 sticks (or 3 straight lines) to make a triangle. Two sticks cannot close into a shape.
