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How can the same pieces of the tangram make this bowl before and after it was chipped? Use the interactivity to try and work out what is going on!

### Cutting Corners

Can you make the most extraordinary, the most amazing, the most unusual patterns/designs from these triangles which are made in a special way?

### Cut and Make

Cut a square of paper into three pieces as shown. Now,can you use the 3 pieces to make a large triangle, a parallelogram and the square again?

# World of Tan 13 - A Storm in a Tea Cup

##### Age 7 to 11 Challenge Level:
Children you may like to:
• complete the silhouettes of two of the convex shapes that can be made;
• find out what you can about the terms convex and concave. Find ways of explaining the ideas to your friend, family and teacher.
• make a collection of things that are concave or convex or both;
• invent an acrostic for both CONCAVE and for CONVEX (hint: Xray/ Xylophone/ Xmas..).
Parents you may like to:
• explain your understanding of the terms convex and concave and how you remember which is which;
• form a collection of things from around the house that are convex/ concave in design; e.g. a empty cup - is this convex or concave or both? what about a full cup?
• explore what happens when looking in convex/ concave mirrors
• find other words that are often used to mean convex/ concave Can you find a 7 letter word for convex? 8 letter word for concave? etc..
Teachers you may like to:
• investigate the other 11 REMAINING convex figures that can be made using the tangram
• explore when convex/ concave lens and mirrors are used and why.
• explore more fully the mathematical definitions for convex and concave shapes (see below)
• consider where terms like 'rude health' come from and try to list more that are similar
• discuss in what other contexts animals are used to describe behaviour and other human characteristics? e.g. (Mai Ling) being badgered by the workmen horsing around! wolfing food down!......