← Class 3 unitsComputational Thinking
Class 3
Chapter 5: Fun with Shapes
We can recognise 2D shapes by counting their sides and corners. A triangle has 3, a square 4, a pentagon 5, and so on.
Learning outcomes
- Classify 2D shapes by sides and corners
- Continue and complete shape patterns
Activities
- Tangram puzzle
- Pattern-completion grid
Worked examples
Read through these first, then try the practice below.
Example 1 — Naming a shape
A flat shape has 5 sides and 5 corners. What is it called?
Solution: A 5-sided polygon is called a pentagon.
Example 2 — Continue the pattern
▲ ● ▲ ● ▲ ? What comes next?
Solution: The pattern alternates triangle and circle, so the next shape is ●.
Self-do practice
Question 1 of 3 · Score 0/0How many sides does a hexagon have?
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