1. Word cloud

120 seconds

How many sides does a triangle have?

2. Slide

60 seconds

Perimeter is the distance around the outside of a shape. Polygons are shapes with 3 or more sides, like a triangle or a square. To find the perimeter of a polygon, add up the length of all its sides.

Perimeter of Polygons

3. Slide

60 seconds

Perimeter is the distance around the outside of a shape or space. It is measured in units like feet, meters, or centimeters. Polygons are shapes that have three or more sides and angles. Examples are triangles, rectangles, and pentagons. To find the perimeter of a polygon, add up the lengths of all the sides. The answer is the perimeter of the polygon.

Concepts:

4. Slide

60 seconds

The perimeter of a polygon is the same as the total length of its sides. The perimeter of a polygon can be calculated using the formula The perimeter of a circle is called its circumference, and it is calculated using the formula

Did you know?

5. Open question

300 seconds

How are the sides of a polygon connected?

6. Open question

300 seconds

What is the difference between the perimeter and the area of a polygon?

7. Open question

300 seconds

What strategies did you use to calculate the perimeter of the polygons?

8. Open question

300 seconds

How did you develop an understanding of perimeter?

9. Drawings

450 seconds

Brain break: Draw a smiling sun wearing a party hat and popping out of a cupcake.

10. Poll

60 seconds

What is the perimeter of a square that has sides of length 5cm?

- 25cm
- 20cm
- 15cm
- 10cm

11. Poll

60 seconds

What is the perimeter of a rectangle that has sides of length 6m and 8m?

- 36m
- 14m
- 48m
- 28m

12. Poll

60 seconds

What is the perimeter of an equilateral triangle with sides measuring 7 cm each?

- 28 cm
- 14 cm
- 21 cm
- 35 cm

13. Poll

60 seconds

What is the formula for finding the perimeter of a rectangle?

- P = (l × w) /2
- P = l × w
- P = 2(l + w)
- P = l + w

14. Poll

60 seconds

What is the formula for finding the perimeter of an irregular polygon?

- Multiply its area by two.
- Divide it by its number of vertices.
- There's no single formula.
- Add up all its sides' lengths.

15. Open question

180 seconds

Work together in pairs: Q: What is the formula for finding the perimeter of a polygon?

Made with ❤️ from Norway