Corrected entry: Kim was asked to draw a circle of diameter 3km. The diameter of circle she drew is not 3km. The length of thread is ~3km, but the thread is not parallel to the ground, so the actual diameter might be something like 1.5 or 2, depending on the angle. (00:44:55 - 00:45:55)
karnatiharish
19th Feb 2013
Correction: We can see that the length of shoelace is not even half of the whole length. We never see the scale when she measures out the 3km so we don't know how long 3km is in scale of the map. The 4.5km circle she draws uses more length, is larger, and fits in scale in reference to the 3km circle.
XIII