[realmswalker (OP)]

http://www.ebaumsworld.com/trigrid.html
can anyone explain that to me?
added up the area of the individual peices = 32
but doing 1/2(hb) the top triangle has an area of 32.5 or IM SO CONFUSED

[chimera]

The diagonal on the bottom one only LOOKS straight. Take a close peek.

The living are the dead on holiday.  -- Maurice de Maeterlinck (1862-1949)

[Ultima]

Yeah the triangles don't have the same angles as each other. I can’t find my calculator at the mo... So I can't do cos-1 because im to retarded. They use a big thick line to trick your eye. It's not even a puzzle it's just how you can arrange them???

wOw the world spins?

[chimera]

Sneaky eh? One is slightly concave, the other slightly convex.

Well, it's not as if you can always trust the eye, check this one for instance:

http://www.grand-illusions.com/images/shades%20illusion.jpg

The living are the dead on holiday.  -- Maurice de Maeterlinck (1862-1949)

[DoctorBeaver]

quote:http://www.grand-illusions.com/images/shades%20illusion.jpg

That's out of order. I've already imbibed copious quantities of booze & you do that to me!

[chimera]

And without as much as batting an eye. True cruelty, I know.

More?

The living are the dead on holiday.  -- Maurice de Maeterlinck (1862-1949)

[Ultima]

chimera yeah that’s a good one, although if you use your peripheral vision it doesn't work?? Spose your brain doesn’t try and fill in detail then.

wOw the world spins?

[DoctorBeaver]

OK, I'm ready now [8D]

[chimera]

Here's Akiyoshi's illusion pages: Not for people with tendencies to have epileptic fits ! (same goes for stroboscopic effects, btw)

http://www.ritsumei.ac.jp/~akitaoka/index-e.html

You'll  see that peripheral vision is quite important, indeed.
The living are the dead on holiday.  -- Maurice de Maeterlinck (1862-1949)