Pupils select the best position to put a security camera in a shop.
- National Curriculum levels 4 to 7
- 30 minutes to 1 hour
- Ruler, calculator, 1cm squared paper; spare copies of shop plan
Key Processes involved
- Draw correct sight lines to identify which parts of the shop are visible and which are hidden
- Find the percentage of the shop that is hidden and compare hidden areas from various viewpoints
- Interpreting and evaluating
- Vary the position of the camera systematically and evaluate each position, trying to minimise the hidden area
- Explain how they know that this is the best position
Check that students understand the context, eg with pictures of security cameras from the internet and with questions such as:
- Have you ever seen a security camera in a shop or a bus? What did it look like?
- Some may not look like cameras at all, but like small hemispheres. .
- The drawing shows a plan view of the shop, which means we are looking down on the shop from above.
Pupils can tackle the task in different ways but they might be expected to:
- construct sight lines
- find the areas of triangles and quadrilaterals
- calculate fractions and percentages of areas