Assertion: right triangle | /r/HasProperty | special case of a triangle
Facets:
Source sentences:
text: A right triangle is a special case of a triangle where 1 angle is equal to 90 degrees.
text: A 30-60-90 right triangle (literally pronounced "thirty sixty ninety") is a special type of right triangle where the three angles measure 30 degrees, 60 degrees, and 90 degrees.