Assertion: ruler's side | /r/HasProperty | perpendicular
Facets:
value: mutually
type: MANNER
Source sentences:
text: The triangle with three sides of unequal length is called a 30° / 60° set square because the 'sharp' angle is 30°, the 'blunt' angle is 60° and the one where the two sides are mutually perpendicular is 90°.
text: The other angle - the one where the two sides are mutually perpendicular - is 90°.