Two-Dimensional Shapes – Basic 1 Mathematics Lesson Note (Third Term)

Two dimensional shapes

Basic 2D Shapes:

Circle: ○

• Made of curved lines
• Round shape
• No corners
• No straight sides

Square: □

• Made of straight lines
• 4 equal sides
• 4 corners

Triangle: △

• Made of straight lines
• 3 sides
• 3 corners

Rectangle: ▭

• Made of straight lines
• 4 sides (2 long, 2 short)
• 4 corners

Recognition of lines

Types of Lines:

Straight Lines: 

Lines that go in one direction without bending. Examples: _____ _____ _____

Curved Lines: 

Lines that bend and are not straight. Examples: ∿ ∿ ∿

Exercise 11: Circle the straight lines: _____ ∿ _____ ∿ _____

Exercise 12: Circle the curved lines: _____ ∿ _____ ∿ _____

Exercise 13: Draw 3 straight lines:

Exercise 14: Draw 3 curved lines:

Exercise 15: True or False:

1. A straight line bends ___
2. A curved line is not straight ___
3. This is a straight line: _____ ___
4. This is a curved line: ∿ ___

Exercise 16: Name these shapes:

1. ○ = _____
2. □ = _____
3. △ = _____
4. ▭ = _____

Exercise 17: Count the sides:

1. Circle has _____ straight sides
2. Square has _____ sides
3. Triangle has _____ sides
4. Rectangle has _____ sides

Exercise 18: Count the corners:

1. Circle has _____ corners
2. Square has _____ corners
3. Triangle has _____ corners
4. Rectangle has _____ corners

6. Description of shapes

Exercise 19: Complete the descriptions:

1. A circle is _____ and has no corners.
2. A square has _____ equal sides and _____ corners.
3. A triangle has _____ sides and _____ corners.
4. A rectangle has _____ sides and _____ corners.

Exercise 20: Which shapes have straight lines? Circle the correct shapes: ○ □ △ ▭

Exercise 21: Which shapes have curved lines? Circle the correct shapes: ○ □ △ ▭

Exercise 22: Match shapes to descriptions:

• Round with no corners → Triangle
• 4 equal sides → Circle
• 3 sides and 3 corners → Square
• 4 sides (2 long, 2 short) → Rectangle

Exercise 23: Find shapes around you:

1. Something round like a circle: _____
2. Something square: _____
3. Something triangular: _____
4. Something rectangular: _____

Exercise 24: Draw and label:

1. Draw a circle and write “circle”
2. Draw a square and write “square”
3. Draw a triangle and write “triangle”
4. Draw a rectangle and write “rectangle”