# Lesson 97: Naming 2D shapes

🧮 MATH (40 Lessons) • 🟣 C. Geometry and Measurement

← Back to Level 1

## Objective

I can name and describe 2D shapes like circles, triangles, squares, and rectangles. I can use words like sides and corners and find these shapes in real-life objects.

## Materials

- Shape cards or pictures of circles, triangles, squares, and rectangles
- A few real objects (for example: a coin, book, door, sign)
- Pencil and notebook or scrap paper

## Mini-lesson — What are 2D shapes?

A 2D shape is a flat shape you can draw on paper. We can talk about how many sides and corners it has.

Circle

- A circle is round.
- It does not have straight sides or corners.
- Examples: a coin, a clock face, a round button.

Triangle

- A triangle has 3 straight sides.
- It has 3 corners.
- Examples: a road sign, a slice of pizza (triangle shaped).

Square

- A square has 4 straight sides.
- All the sides are the same length.
- It has 4 corners.
- Examples: a small tile, some windows, a game board square.

Rectangle

- A rectangle also has 4 straight sides.
- It has 2 longer sides and 2 shorter sides.
- It has 4 corners.
- Examples: a door, a book, a phone screen.

In this lesson, we will look at these 2D shapes, say their names, and talk about their sides, corners, and real-life examples.

Picture strip: Shape posters for 2D shapes

Circle & triangle

Square & rectangle

## Guided Practice — Name and describe 2D shapes

You will look at shape cards or real objects, say the shape name, and talk about sides, corners, and real-life examples. Then you will use the tracing pad.

1. Show a circle: Look at a circle card or a round object (like a coin). Say, "This is a circle. It is round and has no corners".
2. Show a triangle: Point to each side and count 3 sides and 3 corners. Say, "This is a triangle".
3. Show a square: Count the 4 sides. Check that they are all equal. Say, "This is a square".
4. Show a rectangle: Count the 4 sides. Talk about 2 long sides and 2 short sides. Say, "This is a rectangle".
5. Sort real objects: Hold up a book, a door, a clock, or a sign. Ask, "Which shape is this most like?" (circle, triangle, square, or rectangle).
6. Talk about sides and corners: For each shape, ask: "How many sides? How many corners?" Say the numbers out loud together.
7. Use the tracing pad: Trace shape words like circle, square, triangle, rectangle, or words like side and corner. Then write one short sentence, such as "A square has 4 sides."

Tracing Pad
Lines
Trace
Pen

## Practice 1 — Name the 2D shape

[PLACEHOLDER PRACTICE 1]

## Practice 2 — Sides and corners

[PLACEHOLDER PRACTICE 2]

## Practice 3 — Find shapes in real life

[PLACEHOLDER PRACTICE 3]

## Quick Check — Naming 2D shapes

Answer each question about 2D shapes. You may look at real objects around you to help.

1) What is a 2D shape?

A solid shape you can hold in your hand A flat shape you can draw on paper A number sentence
2D shapes are flat shapes we can draw on paper.

2) Which shape is round and has no corners?

Square Triangle Circle
A circle is round and does not have corners.

3) How many sides does a triangle have?

3 4 5
A triangle has 3 sides and 3 corners.

4) Which shape has 4 sides that are all the same length?

Rectangle Square Triangle
In a square, all 4 sides are the same length.

5) A rectangle has:

3 sides and 3 corners 4 equal sides 4 sides, with 2 long and 2 short
A rectangle has 4 sides. Two are longer and two are shorter.

6) How many corners does a square have?

4 3 2
A square has 4 sides and 4 corners.

7) Which shape has no straight sides?

Triangle Circle Rectangle
A circle is curved all the way around and has no straight sides.

8) A road warning sign that looks like a slice of pizza is often which shape?

Circle Square Triangle
Many warning signs use a triangle shape.

9) Which object is most like a rectangle?

A door A coin A round plate
Doors are usually rectangles.

10) Which object is most like a circle?

A book A clock face A notebook page
Many clocks have a round, circle face.

11) How many sides does a square have?

2 3 4
A square has 4 straight sides.

12) You see a window that looks like a square. Which sentence is true?

All 4 sides are the same length. It has 3 sides and 3 corners. It has no corners.
A square has 4 equal sides and 4 corners.

13) You draw a shape with 3 sides and 3 corners. What shape is it?

Square Triangle Circle
A triangle always has 3 sides and 3 corners.

14) Which picture could be a rectangle?

A completely round shape A shape with 3 sides A shape with 4 sides, 2 long and 2 short
Rectangles have 4 sides, with 2 long and 2 short sides.

15) Why is it helpful to learn the names of 2D shapes?

So you can talk about shapes you see in the world So you never look at signs So you forget numbers
Knowing shape names helps you describe and talk about the world around you.

## Assessment (parent/teacher)

Student can name circle, triangle, square, and rectangle. Student can tell how many sides and corners each shape has. Student can explain the difference between a square and a rectangle. Student can find examples of 2D shapes in real-life objects or pictures. Student can use shape words correctly when describing a picture.

## Exit ticket (student)

😀 I can name and describe 2D shapes easily. 🙂 I know some 2D shapes but still need more practice. 😅 Naming 2D shapes still feels tricky for me.

#### Next time I will practise…

Naming circle, triangle, square, and rectangle Counting sides and corners Finding shapes in real-life objects
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