12.1 Solids Flashcards
faces of a polyhedron
the polygons that bound the polyhedron
edge of a polyhedron
a line segment formed by the intersection of two faces of the polyhedron
vertex of a polygon
a point where 3 or more edges meet
tetrahedron
octahedron
dodecahedron
isosahedron
a polyhedron with 4 faces
a polyhedron with 8 faces
a polyhedron with 12 faces
a polyhedron with 20 faces
surface of a polyhedron
consists of ALL points on its faces
convex polyhedron
if ANY TWO POINTS on its surface can be connected by a line segment that lies entirely inside OR on the polyhedron (surface)
regular polyhedron
a polyhedron where all of the faces are congruent and regular polygons AND the same number of faces meet at each vertex in exactly the same way
regular tetrahedron cube regular octahedron regular dodecahedron regular icosahedron
a regular polyhedron with 4 triangular faces
a regular polyhedron with 6 square faces
a regular polyhedron with 8 triangular faces
a regular polyhedron with 12 pentagonal faces
a regular polyhedron with 20 triangular faces
ALL regular polyhedrons are…
CONVEX
polyhedron
a solid that is bounded by polygons, called faces, that enclose a single region of space
