- 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. Calendar
Study Guide
Calendar 
Activity Lesson
Time: Birthday Date Worksheet/Answer key
Calendar Worksheet/Answer key
Calendar Worksheet/Answer key
Calendar Worksheet/Answer key
Calendar Worksheet/Answer key
Time Worksheet/Answer key
Time Worksheet/Answer key
Calendar Questions Worksheet/Answer key
Months of the Year Worksheet/Answer key
My Calendar Vocabulary/Answer key
Calendar
Activity LessonWorksheet/Answer keyWorksheet/Answer keyWorksheet/Answer keyWorksheet/Answer keyWorksheet/Answer keyWorksheet/Answer keyWorksheet/Answer keyWorksheet/Answer keyWorksheet/Answer keyVocabulary/Answer keyThe resources above cover the following skills:
Measurement (NCTM)
Understand measurable attributes of objects and the units, systems, and processes of measurement.
Recognize the attributes of length, volume, weight, area, and time.