- Triangle: A polygon with 3 sides and 3 vertices.
- Quadrilateral: A polygon with 4 sides and 4 vertices. Examples include squares, rectangles, parallelograms, and trapezoids.
- Pentagon: A polygon with 5 sides and 5 vertices.
- Hexagon: A polygon with 6 sides and 6 vertices.
- Heptagon (or Septagon): A polygon with 7 sides and 7 vertices.
- Octagon: A polygon with 8 sides and 8 vertices.
[Polygon] Related Worksheets and Study Guides:
.◂Math Worksheets and Study Guides Second Grade. Solids
Study Guide
Solids 
Worksheet/Answer key
Solids Worksheet/Answer key
Solids Worksheet/Answer key
Solids Worksheet/Answer key
Solids Worksheet/Answer key
Area Worksheet/Answer key
3D Space Worksheet/Answer key
3D Space
Worksheet/Answer keyWorksheet/Answer keyWorksheet/Answer keyWorksheet/Answer keyWorksheet/Answer keyWorksheet/Answer keyWorksheet/Answer keyThe resources above cover the following skills:
Algebra (NCTM)
Understand patterns, relations, and functions.
Sort, classify, and order objects by size, number, and other properties.
Geometry (NCTM)
Analyze characteristics and properties of two- and three-dimensional geometric shapes and develop mathematical arguments about geometric relationships.
Recognize, name, build, draw, compare, and sort two- and three-dimensional shapes.
Describe attributes and parts of two- and three-dimensional shapes.
Use visualization, spatial reasoning, and geometric modeling to solve problems.
Recognize geometric shapes and structures in the environment and specify their location.