**Hippocrates' Lunes**

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Annie Fetter | |

Geometry, difficulty level 3. ABC is half a square inscribed in a semicircle. Then a semicircle is constructed on AB. BD is then constructed, the perpendicular bisector of AC, and triangle ABD is shaded, as is the part of the outer semi-circle that's not part of the original semicircle that's not part of the original semicircle. What did Hippocrates prove about the two shaded regions? | |

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Problem #567 |

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