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Posts tagged with scale

Misleading Graphics

January19

This graph (from The Australian) caught my eye today as summer temperatures soared in parts of Australia. Just a pity that there was not a Mathematician on hand to show the scale more accurately? You might be able to guess what the starting value is but, in essence, this is not good graphing from a […]

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Its a Wonderful World

November13

Check out this amazing TED talk which investigates the mathematics of scale and the beauty of the nano world:

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Scale in Math

September27

The Hubble post (below) uses scale in order for us to get a sense of place and size of the image taken in relation to the moon. Scale is important in the Mathematics of Life – we use scale everyday in our house plans, models boats and planes, etc: Source and more info hereĀ 

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Scale and Measurement – Part I

August8

Here’s a good introduction to the concept of Scale and Measurement in Mathematics (answer in Post Support): Estimate the length of this Crocodile that was found in a public pool:

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GeoEye – new perspectives for Measurement in Maths

April24

GeoEye provides amazing satellite images and these can be searched for exercises in measurement and scale, etc. For example, calculate the perimeter of the outer road of State Circle in Canberra, Australia:

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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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