# Avaondale Geo 3D

### 38 terms by Angsioco_Mark

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### polyhedron

a solid figure with many sides, such as a pyramid

### face

a surface forming part of the outside of an object

### edge

a sharp side formed by the intersection of two surfaces of an object

### vertex

the point of intersection of lines or the point opposite the base of a figure

### regular polyhedron

any one of five solids whose faces are congruent regular polygons and whose polyhedral angles are all congruent

### convex

curving or bulging outward

### cross section

a section created by a plane cutting a solid perpendicular to its longest axis

### platonic solids

tetrahedron, cube, regular octahedron, regular dodecahedron, regular icosahedron

### tetrahedron

any polyhedron having four plane faces

### octahedron

any polyhedron having eight plane faces

### dodecahedron

any polyhedron having twelve plane faces

### icosahedron

any polyhedron having twenty plane faces

### prism

a polyhedron with two congruent and parallel faces (the bases) and whose lateral faces are parallelograms

### bases

polygons that make up the bottoms of a polyhedron

### lateral faces

the faces that are not the base of a parallelogram

### right prism

each lateral edge is perpendicular to both bases

### oblique prism

a prism that is not a right prism

### surface area of a polyhedron

the sum of the areas of the faces of the polyhedron

### lateral area of a polyhedron

the sum of the areas of the lateral faces of a polyhedron.

### net

a two-dimensional pattern that you can fold to form a three-dimensional figure

### cylinder

a solid bounded by a cylindrical surface and two parallel planes (the bases)

### right cylinder

A cylinder with the axis perpendicular to both bases.

la=2πrh

SA=2πr²+2πrh

### pyramid

a polyhedron having a polygonal base and triangular sides with a common vertex

### regular pyramid

a pyramid whose base is a regular polygon and whose lateral faces are congruent isosceles triangles

### circular cone

base is a circle & it has 1 vertex.

### lateral surface of a cone

LSA = ½PL
(P is the perimeter/circumference of the base, L is the slant height)

### right cone

A cone in which a perpendicular line drawn from the base to the tip (vertex) passes through the center of the base

V=lwh

### sphere

a three-dimensional closed surface such that every point on the surface is equidistant from the center

### center of a sphere

The point inside a sphere that is the same distance from every point on the sphere.

a segment that has one endpoint at the center and the other endpoint on the sphere

### chord of a sphere

a segment whose endpoints are on the sphere

### diameter of a sphere

a segment passing through the center, with endpoints on the sphere

### great circle

a circular line on the surface of a sphere formed by intersecting it with a plane passing through the center

half of a sphere

### similar solids

solids with the same shape and all their corresponding dimensions are proportional

Example: