Exercises (Page 229)
12. Complete so the resulting figure has two lines of symmetry.
The blue lines form a cross (+). We need to mirror the drawing into all four quadrants.
13. Copy on a dot grid. Draw two more lines to make a shape that has a line of symmetry.
The goal is to complete the polygon so it is symmetric.
- Triangle: Complete it to be isosceles.
- Polygon: Mirror the existing lines across the implicit central axis.