Surface area : octagon.
This is a maths problem on surface area, ideal for use as a lesson starter with KS3 classes. The clip is shot in a shopping centre to provide an engaging, real-life context for the maths. The problem: The shopping-centre floor has an eye-catching design: an equilateral octagon, each side measuring 6...
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| Online Access: |
Full text (MCPHS users only) |
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| Corporate Author: | |
| Format: | Electronic Video |
| Language: | English |
| Published: |
[London] :
Teachers TV/UK Dept. of Education,
2009
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| Series: | Shopping mall ;
1. |
| Subjects: |
| Summary: | This is a maths problem on surface area, ideal for use as a lesson starter with KS3 classes. The clip is shot in a shopping centre to provide an engaging, real-life context for the maths. The problem: The shopping-centre floor has an eye-catching design: an equilateral octagon, each side measuring 6 metres. Students must calculate the surface area of the octagon. Maths expert Isaac Anoom gives three examples of how the problem could be tackled: The first example is to separate the octagon into smaller shapes - 1 square, 4 right-angled isosceles triangles and 4 rectangles. The second example is to think of it as a big square with 4 right-angled triangles cut off. Thirdly, one could divide the octagon into eight isosceles triangles, then divide 360 by 8 and work out the area of the triangle using Pythagoras. This method works for any regular polygon. |
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| Item Description: | Title from resource description page (viewed Mar. 5, 2012). |
| Physical Description: | 1 online resource (2 min.). |
| Playing Time: | 00:02:46 |
| Language: | This edition in English. |
