Step 1Cut three squares of 16 cm × 16 cm in corrugated cardboard.
Glue them together.
Let it dry.
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Step 2On one side of the square, draw the 3 blue lines as shown on the diagram.
Use a ruler to be precise.
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Step 3With a cutter and a ruler, cut straight along these 3 lines to create 4 shapes.
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Step 4Cut out three small strips of bristol the thickness of the square and 2 cm long.
Fold them in half and un fold.
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Step 5Glue the three hinges as indicated in the step 2 diagram with small circles
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Step 6Once the glue is dry, you can unfold the square and turn it into a triangle as shown below.
You can color each shape as you wish.
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