1 option
Surface area : octagon.
- Format:
- Video
- Series:
- Academic Video Online
- Shopping mall ; 1
- Language:
- English
- Subjects (All):
- Mathematics--Study and teaching--Great Britain.
- Mathematics.
- Mathematics--Problems, exercises, etc.
- Genre:
- Instructional television programs.
- Physical Description:
- 1 online resource (2 min.).
- Place of Publication:
- [London] : Teachers TV/UK Department of Education, 2009.
- Language Note:
- In English.
- Original language in English.
- 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.
- Notes:
- Title from resource description page (viewed Mar. 5, 2012).
- OCLC:
- 829687618
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