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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:
This activity can be approached several ways in the classroom. Each child can be given a set of ten counters, coins or discs and asked to set up the triangle and then physically move the objects. A more abstract approach is to ask the children to draw the shape and visualise what changes can be made and then try them out. A third alternative is to use the interactivity provided and allow the children to move the red circles to form the new triangle.