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http://www.ebaumsworld.com/trigrid.html

Where does the hole come from, what am I missing?

I didn't spend too much time thinking about this(about a minute) but anyone have a clue?

BILL HALL EN FUEGO!
Irish
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i got it quite quickly but its kinda hard to explain in a theory (atlest for me) but i can see where it came from. the orange shaoe is what makes the difference though. the height and the hole are changed by moving it. the green triangle and the orange shape take up most of the room the red did before. the shortening of the shape by moving the ornange leaves the required heigth that the red takes up now. i know that makes no sense but if you look at it and move it with your brain you get it .

it probably doesnt hurt that ive played about a bazillion hours of tetris in my life.
logan
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Man, this one is getting old.

Those two big shape ARE NOT TRIANGLES!!!
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PlayingWithFire
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kingctb27 wrote:I'm lost as well. I'd rather be browsing through the forums here at the Cafe than to figure that out.

Indeed.
go_jays_go
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It just has to do with the fact that the two figures are triangles. Their hypontenuses don't take up exactly square areas, so when you rearrange them, you have to compensate differently depending on their relational position.
JTWood
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JTWood wrote:It just has to do with the fact that the two figures are triangles. Their hypontenuses don't take up exactly square areas, so when you rearrange them, you have to compensate differently depending on their relational position.

Freakin nerd!
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acsguitar
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hongfu_chen wrote:Those two big shape ARE NOT TRIANGLES!!!

Seriously? I did the math, and each triangle had 180 degrees in it. But here's the weird part...

Since those two triangles have parallel bottom and right sides, by rule, their like angles should be identical. They're not. The upper-right angle on the large triangle is 69.444 degrees, while the same angle on the green one is 68.203 degrees.

JTWood
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JTWood wrote:
hongfu_chen wrote:Those two big shape ARE NOT TRIANGLES!!!

Seriously? I did the math, and each triangle had 180 degrees in it. But here's the weird part...

Since those two triangles have parallel bottom and right sides, by rule, their like angles should be identical. They're not. The upper-right angle on the large triangle is 69.444 degrees, while the same angle on the green one is 68.203 degrees.

Ohhhh.....

The big shape isn't really a triangle. Duh!

If you don't believe me, hold a ruler (or something with a straight edge) up to the screen. The shape bowes in the middle. It's not actually a straight line, so it's not a real triangle.

JTWood
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JTWood wrote:
JTWood wrote:
hongfu_chen wrote:Those two big shape ARE NOT TRIANGLES!!!

Seriously? I did the math, and each triangle had 180 degrees in it. But here's the weird part...

Since those two triangles have parallel bottom and right sides, by rule, their like angles should be identical. They're not. The upper-right angle on the large triangle is 69.444 degrees, while the same angle on the green one is 68.203 degrees.

Ohhhh.....

The big shape isn't really a triangle. Duh!

If you don't believe me, hold a ruler (or something with a straight edge) up to the screen. The shape bowes in the middle. It's not actually a straight line, so it's not a real triangle.

With a plasma screen I'd rather let you do all the math...
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