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The vesica piscis is a shape that is the intersection of two disks with the same radius, intersecting in such a way that the center of each disk lies on the perimeter of the other. The name literally means the "bladder of a fish" in Latin after the conjoined dual air bladders found in the bodies of most fishes. The shape is also called mandorla .

The intersection of two congruent disks, each centered on the perimeter of the other.

The vesica piscis is a shape that is the intersection of two disks with the same radius, intersecting in such a way that the center of each disk lies on the perimeter of the other. The name literally means the "bladder of a fish" in Latin after the conjoined dual air bladders ("swim bladder") found in the bodies of most fishes. The shape is also called mandorla ("almond" in Italian).

The vesica piscis in Euclid's Elements

This figure appears in the first proposition of Euclid's Elements, where it forms the first step in constructing an equilateral triangle using a compass and straightedge. The triangle has as its vertices the two disk centers and one of the two sharp corners of the vesica piscis.