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Posts tagged with illusion

Mathematical Ilusion

July3
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Impossible Triangles

April16

One area connecting mathematics and the brain is visual phenomena. Human visual information is processed by the brain and uses ourĀ amazing eyes. Mathematicians have been involved in a wide variety of problems involving vision: * What is the geometry of our perceptual system? * How does the brain process visual information? It is well known […]

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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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