Silvering Measurestone!
We explored perimeter and circumference after identifying some areas to measure on Google Earth. The path measurement feature of Google Earth proved an interesting way to check our findings.
The circumference of a circle is simple to find using pi as long as you know the diameter. However, when we measured outside the centre spot was not nicely marked and we had to find the diameter by measuring across until we had the greatest distance. Anything less was simply a chord! Choosing the right measuring equipment was vital as was having a rough idea of what the answer might be. We had intended to measure the helicopter landing spot next to the Medical Centre but it had a helicopter on it! We made do with a roundabout on closed section of road.
The circumference of the roundabout was about 9.67m.
We also measured the perimeter of a whopping rectangle in the car park. We had to recheck our measurements because groups had such a difference in findings. After a bit more concentration and a long walk, we agreed on our results.
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Wednesday, May 7th, 2008 at 8:04 am under
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[...] The Year 3&4 G&T mathematicians graduated today from the SSC Gifted & Talented programme. Their final session explored circumference and perimeter and took in some chords, arcs and tangents for good measure. The annoying thing was not being able to measure the diameter of helicopter landing spot because a helicopter had landed there. How inconsiderate More details are on the G&T website. [...]
May 7th, 2008 at 3:12 pm