Assertion: octagon's angle | /r/CapableOf | add up to 360°
Facets:
Source sentences:
text: To work this out, all the external angles of any shape add up to 360°, so all we need to do to work the external angle out is divide 360° by the number of sides giving us a sum of 360 divided by 8 sides = 45°; so now we have the exterior angle