Starter quiz
- A polygon is a
- flat (2D), closed figure made up of straight line segments ✓
- flat (2D), closed figure made up of curved line segments
- 3D object made up of straight line segments
- flat (2D), open figure made up of straight line segments
-
- True or false? All parallelograms are rhombuses.
- True
- False ✓
Calculate the perimeter of the square.- '28 cm' ✓
Calculate the perimeter of the rectangle.- '16 cm' ✓
Calculate the perimeter of the kite.- 7.3 cm
- 9.3 cm
- 10.6 cm
- 14.6 cm ✓
-
- An irregular polygon has the following side lengths: 5 cm, 8 cm, 6 cm, 7 cm, and 9 cm. What is the perimeter of the polygon?
- '35 cm' ✓
Exit quiz
- True of false? Summing the length and width of a rectangle gives a result that is half of the perimeter of the rectangle.
- True ✓
- False
The perimeter of the octagon is 184 cm. What is the length of one side?- '23 cm' ✓
- Two line segments are congruent if they are ______
- parallel
- perpendicular
- the same length ✓
- different lengths
-
- A rectangular garden has a length of 12 meters and a width of 8 meters. What is the perimeter of the garden?
- 20 m
- 40 m ✓
- 60 m
- 96 m
-
- Lucas is planning to build a rectangular flowerbed in the backyard. They want the flowerbed to have a perimeter of 36 m. If the width of the flowerbed is 6 m, what should be the flowerbed length?
- 6 m
- 12 m ✓
- 15 m
- 18 m
-
- Dany has a triangular room. The room has side lengths measuring 7 m, 9 m, and m. The perimeter of the triangular room is 28 m. What is the length of side ?
- '12 m' ✓
Worksheet
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Presentation
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Lesson Details
Key learning points
- Missing side lengths can be found if the perimeter is known.
- Perimeter problems involve a context where the distance around a 2D shape is wanted.
Common misconception
Pupils may struggle to think of a different context to apply to finding the perimeter.
An alternative context could be: putting a ribbon around a cake and leaving space for decoration.
Keywords
Perimeter - The perimeter is the distance around a 2D shape.
Polygon - A polygon is a flat (2D), closed figure made up of straight line segments.
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