34 lines
655 B
TeX
34 lines
655 B
TeX
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\begin{tikzpicture}[
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my angle/.style={
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draw, <->,
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angle eccentricity=1.3,
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angle radius=9mm
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}
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]
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% coordinate axis
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\draw[<->] (-2.5,0) -- (2.5,0);
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\draw[<->] (0,-2.5) -- (0,2.5);
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% circle
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\draw (0,0) circle (2cm);
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% coordinates
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\coordinate (A) at ( 2,0);
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\coordinate (B) at ( 0,2);
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\coordinate (C) at (-2,0);
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\coordinate (D) at (0,-2);
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%
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\coordinate (O) at ( 0:0);
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\draw (C) node[anchor=north east] {-1};
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% angles
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\shorthandoff{"}
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\pic[my angle, "$-\pi$"] {angle = C--O--A};
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\pic[my angle, "$\pi$"] {angle = A--O--C};
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\shorthandon{"}
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% \coordinate[pin=300:{$(0,-1)$}] (sinTheta) at (C);
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\end{tikzpicture}
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