@prefix concept: <https://w3id.org/kmath/concept/> .
@prefix course: <https://w3id.org/kmath/course/> .
@prefix math: <https://w3id.org/kmath/> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix review_status: <https://w3id.org/kmath/review_status/> .
@prefix scheme: <https://w3id.org/kmath/scheme/> .
@prefix skos: <http://www.w3.org/2004/02/skos/core#> .
@prefix textbook_section: <https://w3id.org/kmath/textbook_section/> .

concept:three_perpendiculars_theorem a math:Concept ;
    rdfs:label "삼수선 정리"@ko ;
    skos:broader concept:spatial_geometry ;
    skos:definition "평면 α 위에 있지 않은 점 P, 평면 α 위의 점 O, 평면 α 위의 직선 l, 직선 l 위의 점 H에 대하여 PO ⊥ α, OH ⊥ l이면 PH ⊥ l이라는 것과 같이 세 수선 사이의 관계에 관한 정리이다."@ko ;
    skos:editorialNote "2026-09-28 개념 모델 정비에서 2022 개정 교육과정 성취기준을 근거로 추가했다. 도메인 전문가 검토가 필요하다."@ko ;
    skos:inScheme scheme:concepts ;
    skos:prefLabel "theorem of three perpendiculars"@en,
        "삼수선 정리"@ko ;
    math:introducedIn course:geometry ;
    math:requires concept:pythagorean_theorem,
        concept:spatial_geometry ;
    math:requiresTransitively concept:angle,
        concept:geometric_construction,
        concept:integer,
        concept:parallel_line_property,
        concept:polygon_property,
        concept:positional_relation,
        concept:power,
        concept:pythagorean_theorem,
        concept:rational_number,
        concept:similarity,
        concept:spatial_geometry,
        concept:square_root,
        concept:triangle_congruence,
        concept:triangle_similarity ;
    math:reviewStatus review_status:needs_review ;
    math:sourceSection textbook_section:national_curriculum_2022_geometry_spatial_geometry_coordinates ;
    math:taughtIn course:geometry .