Tuesday, September 13, 2011

Term 4 Week 1 (Tuesday)

5K
1) Math AB - Recall 5 and 5.1
2) OnSponge Corrections - 9.5 to 9.9 Complete and tapled together!
3) Sign CA2 Math Paper - For checking tomorrow.

5L
1) Math AB - Recall 5 and 5.1
2) OnSponge Corrections - 9.4 to 9.7 (Will discuss 9.8 and 9.9 tomorrow)
3) Sign CA2 Math Paper - For checking tomorrow.

Question Of the Day:
Who invented/started "degrees" to measure angles?

Related to Angles - How can angles help us to measure/estimate the height of a tall structure?
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4 comments:

  1. AnonymousSeptember 14, 2011 at 9:08 PM

    google failed, but probably some greeks

    ReplyDelete
  2. loh yutongneedabreakSeptember 14, 2011 at 9:09 PM

    google failed, but probably some greeks

    ReplyDelete
  3. loh yutongneedabreakSeptember 14, 2011 at 9:12 PM

    The ancient Persians, probably. They chose 360 degrees to make a full circle not because of its similarity to the number of days in the year, but because their number system was based on 60, because it could be divided by so many other numbers (factors), unlike our 10.

    From them we have 60 seconds in a minute and 60 minutes in an hour. Factors of 60 are 1,2,3, 4, 5, 6 ... well you can finish working that out. Factors of 10 are a mere 2 and 5. 12 is more useful to us, and 12 x5 = 60.

    There are 60 seconds in a minute, 60 minutes in a degree, and 60x6 (360) degrees in a full circle.
    Source(s):
    mathematics, the abstract science of space, number, and quantity. It was practised by the ancient Egyptians, Sumerians, Indians, and Chinese in a rudimentary form, notably for surveying and commercial purposes.

    ReplyDelete
  4. lau wei junSeptember 22, 2011 at 9:22 PM

    stapled you spelled wrong you spelled tapled haha so funny

    ReplyDelete

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