Un problema que relaciona varias áreas de las matemáticas, no es difícil, pero sí interesante.
Dada la media circunferencia de radio R, determinar una fórmula para calcular el radio r de la circunferencia interior en términos de a, b y R.
Clear[R, r, m]
R = 1;
Manipulate[r = (R^2 - m^2)/(2 R); ap = Sqrt[2 r (R + m) - r^2];
bp = -m (m - r)/r + Sqrt[m^2 + r^2] R/r;
an = Sqrt[2 r (R - m) - r^2];
bn = -m (m + r)/r + Sqrt[m^2 + r^2] R/r;
Show[Graphics[{{Red, Line[{{-R, 0}, {R, 0}}]}, {Circle[{m, r}, r],
Red, Circle[{0, 0}, R, {0, Pi}]},
PointSize[0.02], {Orange, Point[R {m, r}/Sqrt[m^2 + r^2]],
Point[{m, r}],
If[m >= 0, {Text["b", {m - 1.1 r, (bp + ap)/2}],
Text["a", {m - 1.1 r, (r + ap)/2}],
Text["r", {m + r/2, 1.1 r}], Point[{m - r, r}],
Point[{m - r, ap}], Point[{m - r, bp}], Pink,
Line[{{m - r, r}, {m - r, ap}}], Black,
Line[{{m, r}, {m + r, r}}],
Line[{{m - r, ap}, {m - r, bp}}]}, {Text[
"b", {m + 1.1 r, (bn + an)/2}],
Text["a", {m + 1.1 r, (r + an)/2}],
Text["r", {m - r/2, 1.1 r}], Point[{m + r, r}],
Point[{m + r, an}], Point[{m + r, bn}], Pink,
Line[{{m + r, r}, {m + r, an}}], Black,
Line[{{m - r, r}, {m, r}}],
Line[{{m + r, Sqrt[2 r (R - m) - r^2]}, {m + r, -m (m + r)/r +
Sqrt[m^2 + r^2] R/r}}]}]}, {Green,
Line[{{0, 0}, {2 Sign[m], 2 r/Abs[m]}}]}}],
Plot[-m x/r + Sqrt[m^2 + r^2] R/r, {x, -3 R/2, 3 R/2}],
Ticks -> None, Axes -> False, AspectRatio -> 1,
PlotRange -> {{-1, 1} 5 R/4, {-0.25, 2.25} R}], {{m, 0.5,
"Centro"}, -9 R/10, 9 R/10}]
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