Assertion: right triangle's angle | /r/HasProperty | given
Facets:
Source sentences:
text: When the sides of the triangle are not given and only angles are given, the area of a right-angled triangle can be calculated by the given formula:
text: Two angles are given: 90 degrees and 53.13 degrees.
text: If two angles are given, add them together and then subtract from 180°.