Butterfly Fold

In the picture

1. 1The dashed centre line: the straight fold shared by both halves.
2. 2A dot on one wing: a point that has an exact match on the other wing.
3. 3The grey joining line: it crosses the dashed line at a right angle, with equal lengths on both sides.

Examples

• A folded paper heart.
• A face seen in a mirror.

Quiz: Butterfly Fold (Age 11)

1. 1

   What makes a shape have axial symmetry?

   • It has two sides that are different from each other.
   • It can be spun around and still look the same.
   • A straight line can fold it into two matching halves.
2. 2

   For axial symmetry, where is the matching point on the other side of the line?

   • Twice as far from the line.
   • Anywhere on the other side of the line.
   • At the same distance from the line.
3. 3

   What is true about the line joining a point to its matching point across the axis?

   • It crosses the axis at any angle and has unequal lengths.
   • It runs along the axis of symmetry.
   • It crosses the axis at a right angle and has equal lengths on both sides.

The answers, each with its explanation, are in the app. This lesson has left the free week, so its quiz is part of the subscription.