Mon Prof Augmenté
Tiles and Cord on a Tray
Age 10 · Maths
The tray floor is covered with identical square tiles, and counting them tells you how much surface there is. The red cord follows the rim all the way round, and its length is the distance around the edge.
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Age 10: open this week
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In the picture
- A single square tile: one unit square of surface
- The red cord along one side: the length of that part of the boundary
- The pin at a corner: a point where two sides of the boundary meet
Examples
- A chocolate bar: the squares of chocolate show its area, and the edge of the wrapper shows its perimeter.
- A football pitch: the grass surface is the area, and the white line around it is the perimeter.
Key takeaways
- Area counts the unit squares that cover a surface.
- Perimeter adds up the lengths of all the sides around the edge.
Quiz: Tiles and Cord on a Tray (Age 10)
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What does area count?
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What does perimeter add up?
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If identical unit squares completely cover a figure, what does counting them measure?
The answers, each with its explanation, are in the app. This lesson has left the free week, so its quiz is part of the subscription.
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