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If I have these two shapes:

and I overlap them a bit, I get this:

The overlapped part looks like this:

Can you match these pairs of shapes with the shape you would get if you overlapped them?

What other interesting overlap shapes can you make using a square, a rectangle and an equilateral triangle?
Andrew decorated 20 biscuits to take to a party. He lined them up and put icing on every second biscuit and different decorations on other biscuits. How many biscuits weren't decorated?