@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:sphere_equation a math:Concept ;
    rdfs:label "구의 방정식"@ko ;
    skos:definition "좌표공간에서 중심이 (a, b, c)이고 반지름의 길이가 r인 구의 방정식은 (x − a)² + (y − b)² + (z − c)² = r²이다."@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 "equation of a sphere"@en,
        "구의 방정식"@ko ;
    skos:topConceptOf scheme:concepts ;
    math:introducedIn course:geometry ;
    math:requires concept:circle_equation,
        concept:spatial_coordinates ;
    math:requiresTransitively concept:angle,
        concept:circle_equation,
        concept:coordinate_plane,
        concept:distance_between_points,
        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_coordinates,
        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,
        textbook_section:national_curriculum_2022_geometry_vectors ;
    math:taughtIn course:geometry .