Perimeter
| Site: | Saylor Academy |
| Course: | GKT101: General Knowledge for Teachers – Math |
| Book: | Perimeter |
| Printed by: | Guest user |
| Date: | Tuesday, May 13, 2025, 11:37 PM |
Description
Watch this lecture series introducing the perimeter, and complete the interactive exercises to practice calculating the perimeter of rectangles.
Perimeter: introduction
Source: Khan Academy, https://www.khanacademy.org/math/cc-third-grade-math/3rd-perimeter#imp-perimeter
This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 License.
Perimeter of a shape
Finding perimeter when a side length is missing
Finding missing side length when given perimeter
Practice
Find perimeter by counting units - Questions
1. Each square on the grid is 1 unit square.
What is the perimeter of the shaded rectangle?
________ units
2. Each square on the grid is 1 unit square.
What is the perimeter of the shaded figure?
________ units
3. Each square on the grid is 1 unit square.
What is the perimeter of the shaded square?
________ units4. Each square on the grid is 1 unit square.
What is the perimeter of the shaded square?
________ unitsFind perimeter by counting units - Answers
1. The perimeter is \(16\) units.
2. The perimeter is \(18\) units.
3. The perimeter is \(20\) units.
4. The perimeter is \(34\) units.
Find perimeter when given side lengths - Questions
1. What is the perimeter of the figure?
_______ cm
2. What is the perimeter of the quadrilateral?
_______ meters
3. One side of a rectangle is \(8\) units. Another side is \(5\) units.
What is the perimeter of the rectangle?
_______ units
4. Which of the following expressions can be used to find the perimeter of the rectangle?
Choose 2 answers:
(A) \(2 \times(11+17)\)
(B) \(17+17 \times 2\)
(C) \(11+11+17+17\)
(D) \(11 \times 17\)
5. What is the perimeter of the rectangle?
_______ meters
6. The length of each side of the star is 8 units.
What is the perimeter of the star?
_______ units
7. One side of a regular triangle is 5 units.
What is the perimeter of the triangle?
_______ units
Find perimeter when given side lengths - Answers
1. The perimeter of the figure is \(48\) centimeters.
2. The perimeter of the quadrilateral is \(32\) centimeters.
3. The perimeter of the rectangle is \(26\) centimeters.
4. We can find the perimeter either by adding the lengths of all four sides:
\(11+11+17+17\)
Or by multiplying 2 by \(11+17\):
\(2 \times(11+17)\)
5. The perimeter of the rectangle is \(98\) meters.
6. The perimeter is \(80\) units.
7. The perimeter of the regular triangle is \(15\) units.