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The elements of Euclid for the use of schools and colleges; comprising the first six books and portions of the eleventh and twelfth books; (1903)

Euclid, Todhunter, I. (Isaac), 1820-1884, ed. edt, Simson, Robert, 1687-1768, ed. edt · London; New York, Macmillan · leaf 297

An illustration from The elements of Euclid for the use of schools and colleges; comprising the first six books and portions of the eleventh and twelfth books;, 1903, leaf 297 — ned bysix equal squares. 26. A tetrahedron is a solid figure con-tained by four triangles ; when these bound-ing triangles are all equal and equilateral,the tetrahedron is said to be regular. 27. A regular octahedron is a solid figure contained by eightequal and equilateral triangles. 28. A regular…

Euclid's Elements · Geometry · Mathematics, Greek

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