Assertion: rectangle's angle | /r/HasProperty | ad || bc
Facets:
Source sentences:
text: thatand α + β = 180° (co-interior angles, AD || BC ), so C = α (co-interior angles, AB || DC ) and D = β (co-interior angles, AB || DC ).
text: || DC ) (alternate angles,|| BCA DAC (alternate angles, AD || BC ) AC = CA