Trigonometrical ratios
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As Thales' theorem tells us, trigonometrical ratios of an angle do not depend on the right-angled triangle we choose. Therefore, we can choose a right-angled triangle whose hypotenuse is the radius of a unit circle. We have drawn a set of axes and used the origin as the centre of an auxiliary circle whose radius is equal to one unit. We have drawn a right-angled triangle in the circle, which we will use to define the trigonometrical ratios. By choosing a radius of this length we have made it easier to find, for each trigonometrical ratio of a given angle, a segment whose length is equal to this ratio. This circle whose radius is equal to one unit is called the unit circle.
Área de coñecemento
Contexto educativo
Resource type
Coleccións
Tipo de licenza
Esta obra está baixo licenza" Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
End user
learner
Achegas
publisher
INTEF
10/12/2025
publisher
INTEF .
10/12/2025
publisher
INTEF
10/12/2025
author
Pedro Férez Martínez
10/12/2025
publisher
Instituto de Tecnologías Educativas (ITE)
10/12/2025
editor
Instituto de Tecnologías Educativas (ITE)
10/12/2025
technical validator
José Luis Alcón Camas
10/12/2025