The Pythagorean Theorem VI
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\documentclass[tikz, border=2pt]{standalone}
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\usetikzlibrary{calc}
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\usetikzlibrary{math}
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\begin{document}
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\begin{tikzpicture}[line width=1pt]
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\tikzmath{
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\a = 5; \b = 12; \c = sqrt(\a*\a + \b*\b);
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\l = 5;
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\a = \a / \c * \l;
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\b = \b / \c * \l;
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\c = \l;
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}
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\coordinate (O) at (0, 0);
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\coordinate (A) at (\a, 0);
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\coordinate (B) at (\a, \b);
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\coordinate (C) at (\c, 0);
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\draw (O) circle [radius=\c];
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\draw (O) -- node[above] {$c$} ($(O)-(C)$) node[left, align=center] {$\displaystyle\frac{c+a}{b}=\displaystyle\frac{b}{c-a}$\\ \\ $a^2+b^2=c^2$};
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\draw (O) -- node[above] {$a$} (A);
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\draw (A) -- node[above] {$c-a$} (C);
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\draw (O) -- node[left] {$c$} (B);
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\draw (A) -- node[right] {$b$} (B);
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\draw[thin] (A) ++(-0.05*\l, 0) -- ++(0, 0.05*\l) -- ++(0.05*\l, 0);
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\end{tikzpicture}
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\end{document}
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