But wait, there's more inconvenience to discuss:

The cities of Margaret River, Western Australia (34S, 115E) and Port Elizabeth, South Africa (34S, 25E) are a quarter of the way around the world from each other whether looking at a RE globe or a FE map. Of that there is no argument. What is in contention is the distance and the most direct line between them.

When I measure the RE distance on maps.google.com, it tells me they are 7,980 km apart, and that a straight-line between them runs as far south as 43 2/3 degrees, and lies about 600 km north of Kerguelen Islands.

FE distance and direction differ greatly. Given it is 10,000 km from the North Pole to the Equator, plus 34/90 of 10,000 km from the Equator to the south, the distance from the North Pole to each city is 10,000 + (34/90 x 10,000) = 13,778 km on lines that are 90 degrees apart.

Therefore, on a flat earth, a straight line between the 2 cities would be the hypotenuse of an equilateral right angle triangle with sides of 13,778 km. Therefore the distance between them would be 19,485 km, which is about 2.44 times farther in FET, and the line between them (the hypotenuse) would nearly touch the southern tip of India. This example can be duplicated for any two points on earth, and such a difference will occur every time.

Given that every shipping company in the world for the last 400+ years, and every airline in the world since their inception, have been successfully plotting course and distance based on RET, and that literally zero companies of any kind rely on knowing how far and which way it is from A to B by using FET, the only conclusion any rational person can come to is that the world is round.

To pile on further, the shape of every continent is known, their size is known, and the distance and direction from any point on earth to any other point is known. The only way they can exist as such is on a round earth.