Assertion: triangle | /r/CapableOf | enclose 1/4 of the northern hemisphere
Facets:
Source sentences:
text: The triangle encloses 1/4 of the northern hemisphere (90°/360° as viewed from the North Pole) and therefore 1/8 of the Earth's surface, so in the formula f = 1/8; thus the formula correctly gives the sum of the triangle's angles as 270°.