check this out

[NarutoGoku]

pretty self-explanitory...

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[Rei]

Hm, that one bugged me for a while xD

Reason is that the 2 "triangles" do not have the same side ratio.
You can see that their longest sides do not have the same inclination (don't know if I am using the correct word here :S).
that happens cause the bottom one is not a triangle, but a shape with 4 sides (don't know the word for it again xD), they just look like they are the same, but they aren't^^

 

[Blue Iris]

Hm, that one bugged me for a while xD

Reason is that the 2 "triangles" do not have the same side ratio.
You can see that their longest sides do not have the same inclination (don't know if I am using the correct word here :S).
that happens cause the bottom one is not a triangle, but a shape with 4 sides (don't know the word for it again xD), they just look like they are the same, but they aren't^^

Just what I thought!!!!

......kinda.....

 

[NarutoGoku]

Hm, that one bugged me for a while xD

Reason is that the 2 "triangles" do not have the same side ratio.
You can see that their longest sides do not have the same inclination (don't know if I am using the correct word here :S).
that happens cause the bottom one is not a triangle, but a shape with 4 sides (don't know the word for it again xD), they just look like they are the same, but they aren't^^

thats half of it