Assertion: right triangle's angle | /r/HasProperty | 180°
Facets:
Source sentences:
text: [latex]h[/latex]. Because the angles in the triangle add up to 180 degrees, the unknown angle must be 180°−15°−35°
text: In a Euclidean space, the sum of angles of a triangle equals the straight angle (180 degrees, π radians, two right angles, or a half-turn).