13:41  أَوَلَمْ يَرَوْا أَنَّا نَأْتِي الْأَرْضَ نَنقُصُهَا مِنْ أَطْرَافِهَا ۚ وَاللَّهُ يَحْكُمُ لَا مُعَقِّبَ لِحُكْمِهِ ۚ وَهُوَ سَرِيعُ الْحِسَابِ

“Do they not see that We come to the Earth reducing it from its edges? (Where) Allah commands, there is none to put back His Command. And He is swift in calling to account.”

The above Ayat indicates that Allah reduces the Earth at its edges. The edges should be  poles for a sphere. In fact Earth’s diameter at the equator is 43 Km more than the diameter measured at the poles/edges. This phenomenon is known as ‘Equatorial bulge’ (Source Wikipedia: https://en.wikipedia.org/wiki/Equatorial_bulge).

Below except is from site Universe today (http://www.universetoday.com/15055/diameter-of-earth):

Scientists have learned that the Earth is not a perfect sphere. In truth, it is what is known as an “oblate spheroid”, which is a sphere that experiences flattening at the poles.

According to the 2004 Working Group of the International Earth Rotation and Reference Systems Service (IERS), Earth experiences a flattening of 0.0033528 at the poles. This flattening is due to Earth’s rotational velocity – a rapid 1,674.4 km/h (1,040.4 mph) – which causes the planet to bulge at the equator.

Equatorial vs Polar Diameter:

Because of this, the diameter of the Earth at the equator is about 43 kilometers (27 mi) larger than the pole-to-pole diameter. As a result, the latest measurements indicate that the Earth has an equatorial diameter of 12,756 km (7926 mi), and a polar diameter of 12713.6 km (7899.86 mi).