Assertion: heptagon's angle | /r/HasProperty | interior
Facets:
Source sentences:
text: It has seven interior angles.
text: So any heptagon (7-sided polygon) must have interior angles whose measure totals:
text: A heptagon has 7 exterior angles that add up to 360 degrees and it has 7 interior angles that add up to 900 degrees
text: A heptagon has 7 sides, so the sum of the measures of its interior angles is (7-2)*180 or 900 degrees.