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Here is another triangular shape made from arranging circles.
Move just three of the circles so that the triangle faces in the opposite direction.
You could use this interactivity to try out your ideas:
Cut four triangles from a square as shown in the picture. How many different shapes can you make by fitting the four triangles back together?
In this town, houses are built with one room for each person. There are some families of seven people living in the town. In how many different ways can they build their houses?