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On Conoids and Spheroids (Ancient Greek: Περὶ κωνοειδέων καὶ σφαιροειδέων) is a surviving work by the Greek mathematician and engineer Archimedes (c. 287 BC – c. 212 BC). Consisting of 32 propositions, the work explores properties of and theorems related to the solids generated by revolution of conic sections about their axes, including paraboloids, hyperboloids, and spheroids. The principal result of the work is comparing the volume of any segment cut off by a plane with the volume of a cone with equal base and axis.

The work is addressed to Dositheus of Pelusium.

Footnotes

1. Coolidge 1945:7
2. Heath, Thomas Little (1911). "Archimedes" . In Chisholm, Hugh (ed.). Encyclopædia Britannica. Vol. 02 (11th ed.). Cambridge University Press. pp. 368–369, see page 369. (3) On Conoids and Spheroids.....

References

• Coolidge, J.L. (1945). A history of the conic sections and quadric surfaces. Dover Publications. ISBN 9780486619125. Retrieved 2018-12-16.

External links

• ON CONOIDS AND SPHEROIDS - The Works of Archimedes
• Chisholm, Hugh, ed. (1911). "Conoid" . Encyclopædia Britannica. Vol. 06 (11th ed.). Cambridge University Press. p. 964.
• Chisholm, Hugh, ed. (1911). "Spheroid" . Encyclopædia Britannica. Vol. 25 (11th ed.). Cambridge University Press. p. 661.

v t e Archimedes
Written works	Measurement of a Circle The Sand Reckoner On the Equilibrium of Planes Quadrature of the Parabola On the Sphere and Cylinder On Spirals On Conoids and Spheroids On Floating Bodies Ostomachion The Method of Mechanical Theorems Book of Lemmas (apocryphal)
Discoveries and inventions	Archimedean solid Archimedes's cattle problem Archimedes' principle Archimedes's screw Claw of Archimedes
Miscellaneous	Archimedes' heat ray Archimedes Palimpsest List of things named after Archimedes Pseudo-Archimedes
Related people	Euclid Eudoxus of Cnidus Apollonius of Perga Hero of Alexandria Eutocius of Ascalon
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v t e Ancient Greek mathematics
Mathematicians (timeline)	Anaxagoras Anthemius Archytas Aristaeus the Elder Aristarchus Aristotle Apollonius Archimedes Autolycus Bion Bryson Callippus Carpus Chrysippus Cleomedes Conon Ctesibius Democritus Dicaearchus Diocles Diophantus Dinostratus Dionysodorus Domninus Eratosthenes Eudemus Euclid Eudoxus Eutocius Geminus Heliodorus Heron Hipparchus Hippasus Hippias Hippocrates Hypatia Hypsicles Isidore of Miletus Leon Marinus Menaechmus Menelaus Metrodorus Nicomachus Nicomedes Nicoteles Oenopides Pappus Perseus Philolaus Philon Philonides Plato Porphyry Posidonius Proclus Ptolemy Pythagoras Serenus Simplicius Sosigenes Sporus Thales Theaetetus Theano Theodorus Theodosius Theon of Alexandria Theon of Smyrna Thymaridas Xenocrates Zeno of Elea Zeno of Sidon Zenodorus
Treatises	Almagest Archimedes Palimpsest Arithmetica Conics (Apollonius) Catoptrics Data (Euclid) Elements (Euclid) Measurement of a Circle On Conoids and Spheroids On the Sizes and Distances (Aristarchus) On Sizes and Distances (Hipparchus) On the Moving Sphere (Autolycus) Optics (Euclid) On Spirals On the Sphere and Cylinder Ostomachion Planisphaerium Spherics (Theodosius) Spherics (Menelaus) The Quadrature of the Parabola The Sand Reckoner
Problems	Constructible numbers Angle trisection Doubling the cube Squaring the circle Problem of Apollonius
Concepts and definitions	Angle Central Inscribed Axiomatic system Axiom Chord Circles of Apollonius Apollonian circles Apollonian gasket Circumscribed circle Commensurability Diophantine equation Doctrine of proportionality Euclidean geometry Golden ratio Greek numerals Incircle and excircles of a triangle Method of exhaustion Parallel postulate Platonic solid Lune of Hippocrates Quadratrix of Hippias Regular polygon Straightedge and compass construction Triangle center
Results	In Elements Angle bisector theorem Exterior angle theorem Euclidean algorithm Euclid's theorem Geometric mean theorem Greek geometric algebra Hinge theorem Inscribed angle theorem Intercept theorem Intersecting chords theorem Intersecting secants theorem Law of cosines Pons asinorum Pythagorean theorem Tangent-secant theorem Thales's theorem Theorem of the gnomon Apollonius Apollonius's theorem Other Aristarchus's inequality Crossbar theorem Heron's formula Irrational numbers Law of sines Menelaus's theorem Pappus's area theorem Problem II.8 of Arithmetica Ptolemy's inequality Ptolemy's table of chords Ptolemy's theorem Spiral of Theodorus
Centers	Cyrene Mouseion of Alexandria Platonic Academy
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