@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:orthogonal_projection a math:Concept ;
    rdfs:label "정사영"@ko ;
    skos:broader concept:spatial_geometry ;
    skos:definition "도형 위의 각 점에서 평면에 내린 수선의 발 전체로 이루어진 도형으로, 넓이가 S인 도형과 평면이 이루는 각의 크기가 θ일 때 정사영의 넓이는 S cos θ이다."@ko ;
    skos:editorialNote "2026-09-28 개념 모델 정비에서 2022 개정 교육과정 성취기준을 근거로 추가했다. 도메인 전문가 검토가 필요하다."@ko ;
    skos:exactMatch <http://www.wikidata.org/entity/Q980329> ;
    skos:inScheme scheme:concepts ;
    skos:prefLabel "orthogonal projection"@en,
        "정사영"@ko ;
    math:introducedIn course:geometry ;
    math:requires concept:spatial_geometry,
        concept:trigonometric_ratio ;
    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,
        concept:trigonometric_ratio ;
    math:reviewStatus review_status:needs_review ;
    math:sourceSection textbook_section:national_curriculum_2022_geometry_spatial_geometry_coordinates ;
    math:taughtIn course:geometry .