Trigonométrie - STI2D/STL

Le cercle trigonométrique

Exercice 1 : Convertir des radians en degrés (valeur approchée)

Convertir l'angle suivant en degrés. \[4,21 radians\] Il ne faut pas repréciser l'unité.
(On donnera la réponse sous la forme d'un entier relatif ou d'un nombre décimal arrondi au centième)

Exercice 2 : Retrouver l'angle correspondant a un point correspondantle cercle trignometrique (mesure entre -pi et pi)

Sur le cercle trigonométrique suivant, donner le réel dont le point \( A \) est l'image.

{"init": {"range": [[-1.2, 1.2], [-1.2, 1.2]], "scale": [250, 250]}, "label": [[[-0.5, 0.8660254037844386], "A", "above left", {}], [[0.7071067811865476, 0.0], "\\dfrac{\\sqrt{2}}{2}", "above right", {}], [[0.8660254037844386, 0.0], "\\dfrac{\\sqrt{3}}{2}", "above right", {}], [[0.5, 0.0], "\\dfrac{1}{2}", "above right", {}], [[-0.7071067811865476, 0.0], "- \\dfrac{\\sqrt{2}}{2}", "above left", {}], [[-0.8660254037844386, 0.0], "- \\dfrac{\\sqrt{3}}{2}", "above left", {}], [[-0.5, 0.0], "- \\dfrac{1}{2}", "above left", {}], [[0.0, 0.7071067811865476], "\\dfrac{\\sqrt{2}}{2}", "right", {}], [[0.0, 0.5], "\\dfrac{1}{2}", "right", {}], [[0.0, 0.8660254037844386], "\\dfrac{\\sqrt{3}}{2}", "right", {}], [[0.0, -0.7071067811865476], "- \\dfrac{\\sqrt{2}}{2}", "right", {}], [[0.0, -0.5], "- \\dfrac{1}{2}", "right", {}], [[0.0, -0.8660254037844386], "- \\dfrac{\\sqrt{3}}{2}", "right", {}]], "circle": [[[-0.5, 0.8660254037844386], 0.01, {"fill": "black"}], [[0.0, 0.0], 1.0, {}], [[0.7071067811865476, 0.0], 0.01, {"fill": "black"}], [[-0.7071067811865476, 0.0], 0.01, {"fill": "black"}], [[0.0, 0.7071067811865476], 0.01, {"fill": "black"}], [[0.0, -0.7071067811865476], 0.01, {"fill": "black"}], [[0.8660254037844386, 0.0], 0.01, {"fill": "black"}], [[-0.8660254037844386, 0.0], 0.01, {"fill": "black"}], [[0.0, 0.5], 0.01, {"fill": "black"}], [[0.0, -0.5], 0.01, {"fill": "black"}], [[0.5, 0.0], 0.01, {"fill": "black"}], [[-0.5, 0.0], 0.01, {"fill": "black"}], [[0.0, 0.8660254037844386], 0.01, {"fill": "black"}], [[0.0, -0.8660254037844386], 0.01, {"fill": "black"}]], "line": [[[-1.2, 0.0], [1.2, 0.0], {"subtype": "segment", "arrow-end": "classic-wide-long"}], [[0.0, -1.2], [0.0, 1.2], {"subtype": "segment", "arrow-end": "classic-wide-long"}], [[0.7071067811865476, 0.7071067811865476], [0.7071067811865476, -0.7071067811865476], {"subtype": "segment", "stroke": "#6495ed", "stroke-dasharray": "-.."}], [[0.7071067811865476, 0.7071067811865476], [-0.7071067811865476, 0.7071067811865476], {"subtype": "segment", "stroke": "#6495ed", "stroke-dasharray": "-.."}], [[0.7071067811865476, -0.7071067811865476], [-0.7071067811865476, -0.7071067811865476], {"subtype": "segment", "stroke": "#6495ed", "stroke-dasharray": "-.."}], [[-0.7071067811865476, 0.7071067811865476], [-0.7071067811865476, -0.7071067811865476], {"subtype": "segment", "stroke": "#6495ed", "stroke-dasharray": "-.."}], [[0.8660254037844386, 0.5], [0.8660254037844386, -0.5], {"subtype": "segment", "stroke": "#6495ed", "stroke-dasharray": "-.."}], [[0.8660254037844386, 0.5], [-0.8660254037844386, 0.5], {"subtype": "segment", "stroke": "#6495ed", "stroke-dasharray": "-.."}], [[0.8660254037844386, -0.5], [-0.8660254037844386, -0.5], {"subtype": "segment", "stroke": "#6495ed", "stroke-dasharray": "-.."}], [[-0.8660254037844386, 0.5], [-0.8660254037844386, -0.5], {"subtype": "segment", "stroke": "#6495ed", "stroke-dasharray": "-.."}], [[0.5, 0.8660254037844386], [0.5, -0.8660254037844386], {"subtype": "segment", "stroke": "#6495ed", "stroke-dasharray": "-.."}], [[0.5, 0.8660254037844386], [-0.5, 0.8660254037844386], {"subtype": "segment", "stroke": "#6495ed", "stroke-dasharray": "-.."}], [[0.5, -0.8660254037844386], [-0.5, -0.8660254037844386], {"subtype": "segment", "stroke": "#6495ed", "stroke-dasharray": "-.."}], [[-0.5, 0.8660254037844386], [-0.5, -0.8660254037844386], {"subtype": "segment", "stroke": "#6495ed", "stroke-dasharray": "-.."}]]}

On donnera une valeur dans l'intervalle \(\left[-\pi; \pi\right[\)

Exercice 3 : Retrouver les réels correspondants à la même image dans dans le cercle trigonométrique

Soit les réels A, B, C, D, E tels que :

\(A = \frac{21\pi }{2}\)
\(B = \frac{5\pi }{2}\)
\(C = \frac{13\pi }{4}\)
\(D = \frac{3\pi }{4}\)
\(E = \pi \)

Parmi ces réels, lesquels ont le même point image sur le cercle trigonométrique ?

Exercice 4 : Retrouver l'angle correspondant a un point correspondantle cercle trignometrique (mesure entre 0 et pi)

Sur le cercle trigonométrique suivant, Donner le réel dont le point A est l'image.

{"init": {"range": [[-1.2, 1.2], [-1.2, 1.2]], "scale": [250, 250]}, "label": [[[-0.8660254037844386, 0.5], "A", "above left", {}], [[0.7071067811865476, 0.0], "\\dfrac{\\sqrt{2}}{2}", "above left", {}], [[0.8660254037844386, 0.0], "\\dfrac{\\sqrt{3}}{2}", "above left", {}], [[0.5, 0.0], "\\dfrac{1}{2}", "above left", {}], [[-0.7071067811865476, 0.0], "- \\dfrac{\\sqrt{2}}{2}", "above right", {}], [[-0.8660254037844386, 0.0], "- \\dfrac{\\sqrt{3}}{2}", "above right", {}], [[-0.5, 0.0], "- \\dfrac{1}{2}", "above right", {}], [[0.0, 0.7071067811865476], "\\dfrac{\\sqrt{2}}{2}", "below right", {}], [[0.0, 0.5], "\\dfrac{1}{2}", "below right", {}], [[0.0, 0.8660254037844386], "\\dfrac{\\sqrt{3}}{2}", "below right", {}], [[0.0, -0.7071067811865476], "- \\dfrac{\\sqrt{2}}{2}", "above right", {}], [[0.0, -0.5], "- \\dfrac{1}{2}", "above right", {}], [[0.0, -0.8660254037844386], "- \\dfrac{\\sqrt{3}}{2}", "above right", {}]], "circle": [[[-0.8660254037844386, 0.5], 0.01, {"fill": "black"}], [[0.0, 0.0], 1.0, {}], [[0.7071067811865476, 0.0], 0.01, {"fill": "black"}], [[-0.7071067811865476, 0.0], 0.01, {"fill": "black"}], [[0.0, 0.7071067811865476], 0.01, {"fill": "black"}], [[0.0, -0.7071067811865476], 0.01, {"fill": "black"}], [[0.8660254037844386, 0.0], 0.01, {"fill": "black"}], [[-0.8660254037844386, 0.0], 0.01, {"fill": "black"}], [[0.0, 0.5], 0.01, {"fill": "black"}], [[0.0, -0.5], 0.01, {"fill": "black"}], [[0.5, 0.0], 0.01, {"fill": "black"}], [[-0.5, 0.0], 0.01, {"fill": "black"}], [[0.0, 0.8660254037844386], 0.01, {"fill": "black"}], [[0.0, -0.8660254037844386], 0.01, {"fill": "black"}]], "line": [[[-1.2, 0.0], [1.2, 0.0], {"subtype": "segment", "arrow-end": "classic-wide-long"}], [[0.0, -1.2], [0.0, 1.2], {"subtype": "segment", "arrow-end": "classic-wide-long"}], [[0.7071067811865476, 0.7071067811865476], [0.7071067811865476, -0.7071067811865476], {"subtype": "segment", "stroke": "#6495ed", "stroke-dasharray": "-.."}], [[0.7071067811865476, 0.7071067811865476], [-0.7071067811865476, 0.7071067811865476], {"subtype": "segment", "stroke": "#6495ed", "stroke-dasharray": "-.."}], [[0.7071067811865476, -0.7071067811865476], [-0.7071067811865476, -0.7071067811865476], {"subtype": "segment", "stroke": "#6495ed", "stroke-dasharray": "-.."}], [[-0.7071067811865476, 0.7071067811865476], [-0.7071067811865476, -0.7071067811865476], {"subtype": "segment", "stroke": "#6495ed", "stroke-dasharray": "-.."}], [[0.8660254037844386, 0.5], [0.8660254037844386, -0.5], {"subtype": "segment", "stroke": "#6495ed", "stroke-dasharray": "-.."}], [[0.8660254037844386, 0.5], [-0.8660254037844386, 0.5], {"subtype": "segment", "stroke": "#6495ed", "stroke-dasharray": "-.."}], [[0.8660254037844386, -0.5], [-0.8660254037844386, -0.5], {"subtype": "segment", "stroke": "#6495ed", "stroke-dasharray": "-.."}], [[-0.8660254037844386, 0.5], [-0.8660254037844386, -0.5], {"subtype": "segment", "stroke": "#6495ed", "stroke-dasharray": "-.."}], [[0.5, 0.8660254037844386], [0.5, -0.8660254037844386], {"subtype": "segment", "stroke": "#6495ed", "stroke-dasharray": "-.."}], [[0.5, 0.8660254037844386], [-0.5, 0.8660254037844386], {"subtype": "segment", "stroke": "#6495ed", "stroke-dasharray": "-.."}], [[0.5, -0.8660254037844386], [-0.5, -0.8660254037844386], {"subtype": "segment", "stroke": "#6495ed", "stroke-dasharray": "-.."}], [[-0.5, 0.8660254037844386], [-0.5, -0.8660254037844386], {"subtype": "segment", "stroke": "#6495ed", "stroke-dasharray": "-.."}]]}

(On donnera une valeur dans l'intervalle \(\left[0; \pi\right]\)

Exercice 5 : Convertir des degrés en radians (valeur approchée)

Convertir l'angle suivant en radians. \[193^{\circ}\] Il ne faut pas repréciser l'unité.
(On donnera la réponse sous la forme d'un entier relatif ou d'un nombre décimal arrondi au centième)

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