This document defines basic shapes including squares with 4 equal sides and 4 corners, rectangles with 4 sides, 4 corners and opposite sides that are equal, triangles with 3 sides and 3 corners, circles with 1 continuous curve forming 2 semicircles, semicircles with 1 curve and 1 straight line, and quarter circles with 2 curves and 2 straight lines.

1. Shapes

2. Square
4 equal sides
4 corners

3. Rectangle
4 sides
4 corners
Opposite
sides are
equal

4. Triangle
3 sides
3 corners

5. Circle
1 curve

6. 2 semicircles

7. Semicircle
1 curve
1 straight line

8. 4 quarter circles

9. Quarter circle
2 curves
2 straight
lines