A6/12 Problems with shape and rotational symmetry
Draw some more shapes, but only using right angles (90°) and right angles (45°).
• Use scrap paper and random cutting to make a number of triangles. Pick out any that
look as if they may have a right angle. Fold an irregular-shaped piece of paper in half
then fold the fold in half to form a right angle. Use this to check if the picked-out
triangles do have a right angle or not. Now cut out triangles that do have right angles by
cutting rectangles diagonally in half.