Abyssal Plain Ocean floor more than 50% of earth surface

Notice Wiki says the abyssal plain makes up more than 50% of the surface underwater. So, what are we talking here? 60% 70% 80%? Doesn't matter, at 50% coverage of flat ocean floor, the sphere is not possible.



An abyssal plain is an underwater plain on the deep ocean floor, usually found at depths between 3,000 metres (9,800 ft) and 6,000 metres (20,000 ft). Lying generally between the foot of a continental rise and a mid-ocean ridge, abyssal plains cover more than 50% of the Earth’s surface.[1][2] They are among the flattest, smoothest and least explored regions on Earth.[3] Abyssal plains are key geologic elements of oceanic basins (the other elements being an elevated mid-ocean ridge and flanking abyssal hills).

https://en.wikipedia.org/wiki/Abyssal_plain