TOPIC 13: Perimeter
Domain: Measurement and Data
Common Core State Standard Skills include:
3.MD.8: Solve real world and mathematical problems involving perimeters of polygons, including finding the perimeter given the side lengths, finding an unknown side length, and exhibiting rectangles with the same perimeter and different areas or with the same area and different perimeters.
Domain: Measurement and Data
Common Core State Standard Skills include:
3.MD.8: Solve real world and mathematical problems involving perimeters of polygons, including finding the perimeter given the side lengths, finding an unknown side length, and exhibiting rectangles with the same perimeter and different areas or with the same area and different perimeters.
Lesson 131: Understanding Perimeter
Click on the BRAINPOP link below to view the learning video:


Perimeter is the distance around a figure.
Click below to have Adam Ant teach you about perimeter! :)
Adam Ant Perimeter
Adam Ant Perimeter
You can find the perimeter of a figure by counting unit segments. Look at the figure below. If you count each unit around the rectangle you will see that there are 30 unit segments. So the perimeter of the rectangle is 30 units.
Another way to find the perimeter of a figure is to add the lengths of the sides. Look at the green hexagon below. To find the perimeter, we add 4cm + 4cm +3cm +3cm + 3cm +3cm. The perimeter of the hexagon is 20cm.
When asked to find the perimeter of a shape, be careful that you remember to add ALL the sides, even if the lengths are not labeled. For example, look at the square below. One side is labeled 6 inches. Remember: All 4 sides of a square are the same length. So the perimeter of the square would be found by adding 6in + 6in + 6in + 6in (or 6in x 4)... which is 24 inches!
To find the perimeter of a rectangle, you need to add ALL 4 sides. Remember: Opposite sides of a rectangle are the same length. Look at the example below. Only 2 sides are labeled. but we know the opposite sides are equal. So the perimeter of the rectangle would be 7 + 7 + 4 + 4. So the perimeter of the rectangle is 22 inches.
Lesson 14.5 Area and the Distributive Property
Click HERE to watch a learning video on how to use the Distributive Property.
Below are some learning videos you can watch, to help you practice perimeter.




Below are some learning sites where you can practice your perimeter skills! :)