Assertion: triangle's measure | /r/HasProperty | equal
Facets:
value: to 90°
type: OTHER
Source sentences:
text: The measure of an exterior angle of a triangle is equal to the sum of the measures of the two interior angles that are not adjacent to it; this is the exterior angle theorem.
text: In particular it is possible to draw a triangle on a sphere such that the measure of each of its internal angles is equal to 90°, adding up to a total of 270°.