| --- |
| source: ncert |
| topic: geometry |
| class_level: class_6 |
| chapter: ch13 |
| difficulty: beginner |
| --- |
| |
| Class 6 | Ch13: Symmetry |
| Line of symmetry divides figure into two mirror-image halves. |
| Symmetry count: Equilateral triangle=3, Square=4, Rectangle=2(midpoints only NOT diagonals), Rhombus=2(diagonals), Circle=infinite, Pentagon=5, Hexagon=6, Isosceles triangle=1, Scalene=0, Parallelogram=0. |
| Regular n-sided polygon has n lines of symmetry. |
| Rectangle: 2 lines (horizontal+vertical through midpoints). Diagonals NOT lines of symmetry. |
| Rhombus: 2 lines (both diagonals are lines of symmetry). |
| Letters: Vertical symmetry: A,H,I,M,O,T,U,V,W,X,Y. Horizontal: B,C,D,E. |
| Parallelogram has NO line of symmetry at all. |
