There is no precise "crop factor" due to differences in aspect ratio. You can either compare long side to long side, short side to short side, or diagonal to diagonal.

Long side comparison - 36mm on 35mm film, roughly 250mm from the 8x10 means a crop factor of 6.94. If you crop the 8x10 to a 2:3 ratio, it matches.
Short side comparison - 24mm on 35mm film, roughly 200mm from the 8x10 means a crop factor of 8.33. If you crop the 35mm negative to a 4:5 ratio, it matches.
Diagonal side comparison - 43mm on 35mm film, about 320mm from the 8x10 means a crop factor of 7.44. Doesn't really match but it's a good middle of the road value.

You lose a bit on the 8x10 sheet from the film holders, which can vary, so these aren't immensely precise. The 200 x 250 mmm measurement of 8x10 is based off of the 7.875 x 9.875 nominal film size of 8x10.

So all that being said, that factor from Wikipedia is roughly 7x. Seems like they are comparing the long edge.