Shape Sketches
A straight side joins two vertices. Flat polygons make faces of many solids. A drawing of a cube shows edges in a perspective view, not its actual lengths.
Before you try
Before you play, make a prediction: How many sides does a pentagon have? Explain what you expect and what part of the model will help you check it.
Try it out
Interactive activity
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What happened?
Move a control to see what changes and why.
The game practises one idea at a time with simple drawn pictures. Check the same idea with real objects and your NCERT textbook (Chapter 1: Shapes Around Us, pages 1–23).
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Try these ideas
- Draw the missing sides, then name the flat faces you can see.
- Try a new puzzle with ↻. Describe what changed and which mathematical rule stayed the same.
- Complete a round, then explain your method before you move to the next one.
Why it works
A straight side joins two vertices. Flat polygons make faces of many solids. A drawing of a cube shows edges in a perspective view, not its actual lengths.
A triangle has three sides and three vertices. A cube drawing includes hidden edges shown with dashes. Draw the missing sides, then name the flat faces you can see.
A polygon must close, and its boundary uses straight sides. A curved line is not a polygon side.
This activity connects to Shapes Around Us, NCERT Class 4 maths, printed pages 1–23. Use the picture or objects to explain each step before relying on a calculation. The game practises one part of the chapter at a time; the other three activities extend the chapter’s ideas.
Worked example: How can you complete a pentagon with two missing sides? Locate its five vertices in boundary order. Join each missing neighbouring pair with a straight segment. Check that all five sides close without crossing.
Check your understanding
Question 1 of 2
How many sides does a pentagon have?
Which solid has two matching triangular bases?
Explain it in your own words
What changed? Why did it happen? Where might you notice this in everyday life?
For parents & teachers
- Try with everyday materials. Draw the missing sides, then name the flat faces you can see. Ask the child to make a new example using paper, counters, household objects or a labelled sketch.
- Listen to the explanation. A polygon must close, and its boundary uses straight sides. A curved line is not a polygon side. Ask “How could we check?” and encourage a second representation of the same idea.