Pyramids With Regular Polygon Faces
The regular tetrahedron, one of the Platonic solids, is a triangular pyramid all of whose faces are equilateral triangles. Besides the triangular pyramid, only the square and pentagonal pyramids can be composed of regular convex polygons, in which case they are Johnson solids.
| Tetrahedron | Square pyramid | Pentagonal pyramid | Hexagonal pyramid |
|---|---|---|---|
Read more about this topic: Pyramid (geometry)
Famous quotes containing the words pyramids, regular and/or faces:
“Though castles topple on their warder’s heads,
Though palaces and pyramids do slope
Their heads to their foundations; though the treasure
Of nature’s germens tumble all together,
Even till destruction sicken—answer me
To what I ask you.”
—William Shakespeare (1564–1616)
““I couldn’t afford to learn it,” said the Mock Turtle with a sigh. “I only took the regular course.”
“What was that?” inquired Alice.
“Reeling and Writhing, of course, to begin with,” the Mock Turtle replied; “and then the different branches of Arithmetic—Ambition, Distraction, Uglification, and Derision.”
“I never heard of ‘Uglification,’” Alice ventured to say.”
—Lewis Carroll [Charles Lutwidge Dodgson] (1832–1898)
“In society you will not find health, but in nature. Unless our feet at least stood in the midst of nature, all our faces would be pale and livid. Society is always diseased, and the best is the most so.”
—Henry David Thoreau (1817–1862)