- A 3-sided polygon is called a
**triangle**. - A 4-sided polygon is called a
**quadrilateral**. - A 5-sided polygon is called a
**pentagon**. - A 6-sided polygon is called a
**hexagon**. - And so on...

- Identify the number of sides in different polygons, and be able to name each polygon based on its number of sides.
- Understand that the sides of a polygon are line segments that connect the vertices (corners) of the shape.
- Recognize that the sum of the interior angles of a polygon can be found using the formula:
*(n-2) * 180 degrees*, where*n*is the number of sides of the polygon. - Be able to calculate the perimeter of a polygon by adding the lengths of all its sides together.

Study GuideMeasurement, Perimeter, and Circumference Worksheet/Answer key

Measurement, Perimeter, and Circumference Worksheet/Answer key

Measurement, Perimeter, and Circumference Worksheet/Answer key

Measurement, Perimeter, and Circumference

Geometry (NCTM)

Use visualization, spatial reasoning, and geometric modeling to solve problems.

Use geometric models to represent and explain numerical and algebraic relationships.

Measurement (NCTM)

Apply appropriate techniques, tools, and formulas to determine measurements.

Select and apply techniques and tools to accurately find length, area, volume, and angle measures to appropriate levels of precision.

Develop and use formulas to determine the circumference of circles and the area of triangles, parallelograms, trapezoids, and circles and develop strategies to find the area of more-complex shapes.

Connections to the Grade 7 Focal Points (NCTM)

Measurement and Geometry: Students connect their work on proportionality with their work on area and volume by investigating similar objects. They understand that if a scale factor describes how corresponding lengths in two similar objects are related, then the square of the scale factor describes how corresponding areas are related, and the cube of the scale factor describes how corresponding volumes are related. Students apply their work on proportionality to measurement in different contexts, including converting among different units of measurement to solve problems involving rates such as motion at a constant speed. They also apply proportionality when they work with the circumference, radius, and diameter of a circle; when they find the area of a sector of a circle; and when they make scale drawings.