Education Standards
Finding the Perimeter of a Polygon
Overview
In this resource, students will practice finding the perimeter of a polygon given the length of one side.
3.MDA.6- Find the Area of the Polygon
This is a picture of a polygon with all sides the same length.
Part A
Write an equation to find the perimeter of the polygon.
Part B
Explain why one measurement was enough to find the perimeter of this polygon.
Scoring Rubric Part A
Score 2
- 1 point- Student has the correct answer for the perimeter of the polygon. (25 inches or in.) and
- 1 point- Student has the correct equation written. (Either 5x5 or 5+5+5+5+5)
Score 1
- Student has the correct answer of 25 inches for the perimeter and incorrect equation or:
- Student has incorrect answer of 25 inches and correct equation
Score 0
- Student does not have a perimeter of 25 inches.
- Student wrote incorrect equation.
Scoring Rubric Part B
Score 1
- 1 point for explaining that one measurement is enough to determine the perimeter because all sides are the same length, there for each side is 5 inches.
Score 0
- Student scores 0 points if explanation is incorrect or irrelevant