optical illusion
the angles/gradients of the longest sides of the blue and red triangles are not the same (3:8 versus 2:5), but they look the same (= illusion of a straight line) in the arrangements
in the top arrangement, the longest side of the assembled "triangle" kinks downwards where it meets the corner of the yellow shape
in the bottom arrangement, the longest side of the assembled "triangle" kinks upwards where it meets the corner of the yellow shape
the difference in area between the two quadrilaterals (for that is what they are) = the white square in the bottom one
(
custard, Thu 5 Mar 2009, 23:28,
Reply)
eh? i 'm not sure you're right about that
if you hold a ruler or straight edge up to your monitor, the lines of and around the shaped are straight. Wouldn't the kink show itself if you held a ruler along the perimeter?
EDIT:
I'm sure you're right about that.
i'm sure i have a crap ruler.
(
KittyWaste lives at Sleepingplanet.com, Fri 6 Mar 2009, 5:04,
Reply)