Triangle made up of different building blocks.
Rearrange the blocks and a hole appears. Same triangle.
I love this. Years ago I made a cardboard copy of this inside a drawn triangle. Mind boggling and very strange.
total area = 13 x 5 /2 =32.5
red triangle = 8 x 3 /2 = 12
blue = 5 x 2 /2 = 5
yellow = 5 + 2 = 7
green = 5 + 3 = 8
total of parts = 32
Hmmmmmm????????
Looks like Benetton sponsored the local kite competition
Seeing as though they need ramps and PVC rail slider doo-hickeys to copy every other kewl-OMG-I'm-so-sik sport
Oh yeah geometry. Sorry.......
Anway it is not a hole, a hole is enclosed on all sides.... it is a cut-out or checkout or groove, not a hole
That's why I didn't get it 
The red and blue triangles are not "similar", therefore the hypotenuse of the overall triangle is not a straight line
)
Yeah when you draw the big triangle on graph paper, the red and blue triangles aren't exactly 8 x 3 or 5 x 2, it's slightly less than 2 and slightly more than 3.
So the hypotenuse either bends up or down.
Amazing how little is needed to give you an extra square.
So u slide one along and it changes the angle slightly.
'panda has invented a variable rocker jig.
