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An exercise to review sin, cosin, tangent... by William Emeny, shared at Great Maths Teaching Ideas. It'll catch your secondary school students attention. I'm sure they'll try to solve it. Pila de triángulos rectángulos para repasar seno, coseno, tangente y teorema de Pitágoras. Resulta muy atractiva. Enunciado sin palabras, casi. Fácil de entender. Por William Emeny.

Students explore curves, patterns, and designs created by varying the radii of the circles and the position of the pen.