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Posts tagged with illusions

The Impossible is taking place

September12
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How the Ambiguous Cylinder Works

October27
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Now that looks really weird!

May20

Lakes in the desert, the moon larger when it is on the horizon, Escher’s famous sketches – and, then this recent pic which somehow doesn’t quite seem right? The scale is not correct…or, is it? (For an explanation, check out the Post Support.) Optical illusions are a fun way to get connected with Spacial Geometry. […]

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Lisa Simpson’s Nerd Find

March5

This just in from moillusions (worth checking out this site): I see that TV animated series, The Simpsons quite often present us quite cool optical illusions. This time Lisa Simpson discovered pretty strange object. Emily, reader who submitted this one, said: “Hi, not sure if you’ve gotten this one yet…In the Simpsons episode Treehouse of Horror VIII, the Simpson family is looking […]

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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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