Starter quiz
- Which of these units are a measure of length?
- cl
- kg
- km ✓
- m
- mm ✓
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The image shows a wall whose length has been measured in four parts. The total length of the wall is ______ m.- '420' ✓
Which length is equal to ?-
-
-
-
- ✓
-
- A ______ shape is a shape created using two or more basic shapes.
- compound ✓
- regular
- solid
-
- Solve the equation:
- '8' ✓
- Solve the equation:
- '5' ✓
Exit quiz
- The ______ is the distance around a 2D shape.
- 'perimeter' ✓
- Which of the units could be used to measure perimeter?
- cm ✓
- cm
- cm
-
What is the perimeter of the rectangle?- 7 m
- 10 m
- 12 m
- 14 m ✓
-
When the perimeter of the octagon is ______ mm.- '40' ✓
The perimeter of the hexagon is 24 cm. Find the value of .- '4' ✓
The perimeter of the compound rectilinear shape is ______ cm.- '180' ✓
Worksheet
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Presentation
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Video
Lesson Details
Key learning points
- The perimeter of any polygon can be found by summing the sides.
- The perimeter of shapes made from polygons can be found.
- Some methods for finding perimeters are more efficient than others.
- Missing lengths can be found when the perimeter is known.
Common misconception
Summing all of the given lengths and only the given lengths to find the perimeter.
With each example discuss which lengths are part of the perimeter, which lengths are not and whether any lengths are equal to others.
Keywords
Perimeter - the distance around a 2D shape
Polygon - flat (2D), closed figure made up of straight line segments
Compound/composite shape - a shape created using two or more basic shapes
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