Geometría Plana

Determina semejanza de triángulos: ángulos
https://es.khanacademy.org/math/geometry/hs-geo-similarity/hs-geo-triangle-similarity-intro/e/similar_triangles_1

Resuelve triángulos semejantes (básico)
https://es.khanacademy.org/math/geometry/hs-geo-similarity/hs-geo-solving-similar-triangles/e/solving_similar_triangles_1

Utiliza triángulos semejantes
https://es.khanacademy.org/math/geometry/hs-geo-similarity/hs-geo-similar-and-congruent-triangles/e/solving-problems-with-similar-and-congruent-triangles?modal=1
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Área
Áreas sombreadas
https://es.khanacademy.org/math/cc-seventh-grade-math/cc-7th-geometry/cc-7th-area-circ-challenge/e/shaded_areas

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Relaciones de ángulos con líneas paralelas
https://es.khanacademy.org/math/cc-eighth-grade-math/cc-8th-geometry/cc-8th-angles-between-lines/e/parallel_lines_1

Práctica de ecuaciones con ángulos
https://es.khanacademy.org/math/cc-eighth-grade-math/cc-8th-geometry/cc-8th-angles-between-lines/e/parallel_lines_2