Measuring ShapesSome of the clip art used in this presentation is licensed from the Clip Art Gallery on DiscoverySchool.com
Look at this ‘L’ shape:                 • How would you                   calculate the                   distance around ...
Perimeter• When we measure the distance  around a shape, we call it the  perimeter.• We measure the perimeter using the  l...
The perimeter is found by adding up all the length and breadth measurements.                Length          +             ...
Can you find the perimeter for          this shape?             12 cm5cm                        5cm             12 cm
AnswerAdd up all the length and breadthmeasurements:12cm + 12cm + 5cm + 5cm= 34cm!
• We can write this in another way:  “Twice the length plus twice the  breadth”• This is often written as:2 X l + 2 X b• C...
When calculating the perimeter of a rectangle do we need to     measure all the side?   Talk Partners’ about your ideas   ...
• Can you think of any other shapes  where you would not need to measure  every side in order to work out the  perimeter?•...
CHALLENGE:Can you find the perimeter for this shape?                      5cm                  3         3                ...
How did you workout the answer?Can you expressthis perimeter inwords and letters?
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Calculating Perimeter

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Calculating Perimeter

  1. 1. Measuring ShapesSome of the clip art used in this presentation is licensed from the Clip Art Gallery on DiscoverySchool.com
  2. 2. Look at this ‘L’ shape: • How would you calculate the distance around this shape? • What is the correct mathematical term for this?
  3. 3. Perimeter• When we measure the distance around a shape, we call it the perimeter.• We measure the perimeter using the length and breadth measurements
  4. 4. The perimeter is found by adding up all the length and breadth measurements. Length + + BreadthBreadth + Length +
  5. 5. Can you find the perimeter for this shape? 12 cm5cm 5cm 12 cm
  6. 6. AnswerAdd up all the length and breadthmeasurements:12cm + 12cm + 5cm + 5cm= 34cm!
  7. 7. • We can write this in another way: “Twice the length plus twice the breadth”• This is often written as:2 X l + 2 X b• Can you tell me why?
  8. 8. When calculating the perimeter of a rectangle do we need to measure all the side? Talk Partners’ about your ideas and be ready to feedback to class!
  9. 9. • Can you think of any other shapes where you would not need to measure every side in order to work out the perimeter?• Can you express the perimeter of these shapes in words and in letters?
  10. 10. CHALLENGE:Can you find the perimeter for this shape? 5cm 3 3 c c m m 3cm 3cm 7 7 c c m m 3cm 3cm 3 3 c c m m 5cm
  11. 11. How did you workout the answer?Can you expressthis perimeter inwords and letters?

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