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Answermath.com: Coseno
An online cosine game which offers practice in mental math and times practice. When you submit the wrong answer, it provides the correct one. In Spanish, with links to English and Italian versions.
Ministerio de Educacion, Cultura y Deporte (Spain)
Cnice: Relacion De Ejercicios Interactivos.
In Spanish. Interactive activities online on various geometric and trigonometric concepts such as area, perimeter, secants, tangents, etc. A terrific resource for students. Site is organized acoording to shape. (triangle, quadrilaterals,...
Other
Answermath: Seno
An online sine game which offers practice in mental math and times practice. When you submit the wrong answer, it provides the correct one. In Spanish, with links to English and Italian versions.
Other
Answermath: Tangente
An online tangent game which offers practice in mental math and times practice. When you submit the wrong answer, it provides the correct one. In Spanish, with links to English and Italian versions.