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Posts tagged with π

Pi Day Revisited

December1

Yes, today is NOT Pi Day – well, not officially. After all, every day is Pi Day since every day Pi is being used to solve both simple and complex problems, many times without anyone realizing it. Yes, Pi might just have to be the most exciting irrational number on the planet! What do we mean […]

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Why is Pi so Special?

March26

Good question. Pi is an “irrational number” which has an unending decimal expansion. π is an irrational number, meaning it cannot be referenced exactly as a fraction, but only as a decimal which never ends or repeats.  The current world record has π at a value with some ten trillion decimal points of accuracy.  In a practical sense, a physicist […]

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Relationships – the facebook of numbers

February22

Yes, it’s true – numbers behave much like people. For example, one group of numbers is even and another group odd (you may recognise the odd ones at a party); other numbers are very much alone – we call these the Prime Numbers (more on them in another blog). The Prime Numbers are the ones […]

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Post Support

NCEA Level 2 Algebra Problem. Using the information given, the shaded area = 9, that is:
y(y-8) = 9 –> y.y – 8y – 9 =0
–> (y-9)(y+1) = 0, therefore y = 9 (can’t have a distance of – 1 for the other solution for y)
Using the top and bottom of the rectangle,
x = (y-8)(y+2) = (9-8)(9+2) = 11
but, the left side = (x-4) = 11-4 = 7, but rhs = y+? = 9+?, which is greater than the value of the opp. side??
[I think that the left had side was a mistake and should have read (x+4)?]

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