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Introduction to Perimeter

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Introduction to Perimeter

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What you will learn from this videoWhat you will learn

We’ll learn that perimeter is the distance around a shape.
That we can use perimeter to figure out unknown sides of an object.
And that knowing the perimeter can help us build a fort, have a party, and even hang our favorite picture.

Discussion Questions
- Before Video
  What would you measure with a ruler or yardstick?ANSWER
  - The length of an object.
  What are some measurements you could find with a ruler or yardstick?ANSWER
  - The length of a pencil, the length of the room, the length and width of a desk.
  What is the name of a polygon with 3 sides? 4 sides? 5 sides? 6 sides? 8 sides?ANSWER
  - Triangle; rectangle, square, parallelogram, or quadrilateral; pentagon; hexagon; octagon.
  What is a regular hexagon? How could you decide if a hexagon is a regular hexagon?ANSWER
  - A 6-sided polygon with all sides the same length. Sample answer: You could measure all 6 sides.
  How could you figure out how much border you would need to decorate a bulletin board that is a rectangle?ANSWER
  - Measure around the outside of the rectangle.
- After Video
  What are we finding when we measure all of the outside edges around a shape? ANSWER
  - Perimeter.
  How can you find the perimeter of a square if you only know the length of one side? Why?ANSWER
  - You can add the given measurement 4 times because all 4 sides of a square are equal. Or you could multiply the known length by 4, since all 4 sides are the same length.
  A rectangle has one side length of 20 meters and another side length of 10 meters. What are the measurements of the missing sides of the rectangle?ANSWER
  - The missing sides are 10 meters and 20 meters.
  An octagon has 8 sides of the same length, 100 cm each. How would you find the perimeter of the octagon?ANSWER
  - Add 100 cm eight times; or multiply 8 times 100 cm.
  A pentagon has 4 known side lengths: 5 cm, 15 cm, 20 cm, and 5 cm. It has a perimeter of 58 cm. What is the length of the missing side? How did you find it?
  ANSWER
  - The missing side is 13 cm. "I added the lengths of all sides given, and then subtracted the total from the given perimeter, 58 cm."
Vocabulary
- Hexagon DEFINE
- Pentagon DEFINE
- Polygon DEFINE
- Perimeter DEFINE
- Regular Polygon DEFINE
- Rectangle DEFINE
- Square DEFINE

Reading Material
Practice Word Problems
Practice Number Problems
Lesson Plan
Teacher Guide
Assessment
Online Quiz Game Quiz PDF Exit Ticket