@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:unit_circle a math:Concept ;
    rdfs:label "단위원"@ko ;
    skos:definition "원점을 중심으로 하고 반지름의 길이가 1인 원이다. 각 θ를 나타내는 동경과 단위원의 교점을 P라 하면 P의 좌표는 (cos θ, sin θ)이고 직선 OP의 기울기는 tan θ이므로, 삼각함수의 값과 성질을 좌표로 나타내는 데 쓴다."@ko ;
    skos:editorialNote "2026-09-28 GRIP 대수 개념서와 시발점 워크북 대수가 독립된 학습 항목으로 다루는 것을 근거로 추가했다. 도메인 전문가 검토가 필요하다."@ko ;
    skos:exactMatch <http://www.wikidata.org/entity/Q203425> ;
    skos:inScheme scheme:concepts ;
    skos:prefLabel "unit circle"@en,
        "단위원"@ko ;
    skos:topConceptOf scheme:concepts ;
    math:introducedIn course:algebra ;
    math:requires concept:circle_equation,
        concept:trigonometric_function ;
    math:requiresTransitively concept:angle,
        concept:circle_equation,
        concept:circular_sector,
        concept:coordinate_plane,
        concept:direct_proportion,
        concept:distance_between_points,
        concept:function,
        concept:general_angle,
        concept:geometric_construction,
        concept:graph,
        concept:integer,
        concept:inverse_proportion,
        concept:parallel_line_property,
        concept:polygon_property,
        concept:positional_relation,
        concept:power,
        concept:pythagorean_theorem,
        concept:radian_measure,
        concept:rational_number,
        concept:similarity,
        concept:square_root,
        concept:triangle_congruence,
        concept:triangle_similarity,
        concept:trigonometric_function,
        concept:trigonometric_ratio ;
    math:reviewStatus review_status:needs_review ;
    math:sourceSection textbook_section:grip_algebra_05_06_trigonometric_function_definition,
        textbook_section:grip_algebra_05_sp1_angle_transformation,
        textbook_section:grip_algebra_06_sp1_unit_circle_equations,
        textbook_section:sibaljeom_workbook_algebra_theme14_trigonometric_definition ;
    math:taughtIn course:algebra .