D15 Flashcards

1
Q

Polyhedron

A

A 3-D solid made entirely by polygons

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2
Q

Face

A

A flat surface that makes up part of a 3D figure

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3
Q

Edge

A

A segment formed by the intersection of 3 or more faces

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4
Q

Vertex

A

A point formed by the intersection of 3 or more faces

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5
Q

Are cylinders, spheres, or cones considered polyhedrons ?

A

Nope

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6
Q

Polyhedrons are classified by

A

The number of faces

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7
Q

Regular polyhedron

A

A polyhedron made of congruent regular polygons

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8
Q

There are 5 regular polyhedrons ; these are known as the

A

Platonic solids
( Tetrahedron, cube, octahedron, dodecahedron, isosohedron)

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9
Q

Two types of special polyhedrons are

A

Prims and pyramids

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10
Q

Has two faces called bases that are congruent, parallel polygons.

A

Prism

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11
Q

The other faces of the polyhedron, called ____ ___ , are parallelograms that connect the corresponding sides of the bases

A

Later faces

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12
Q

The later faces meet to form the

A

Lateral edges

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13
Q

Prisms are classified by their

A

Bases

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14
Q

The ____ of a prism is the length of ita altitude, any perpendicular segment from one base to the plane of the other base

A

Height

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15
Q

A prism whose lateral faces are rectangles is called a

A

Right prism

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16
Q

It’s lateral edges are _____ to it’s bases

A

Perpendicular

17
Q

A prism that is not a right prism is called an

A

Oblique prism

18
Q

Has only one polygonal base. The other faces of the polyhedron, called lateral faces, are triangles that meet to form the lateral edges.

19
Q

A pyramid whose base is a regular polygon is called a

A

Regular pyramid.

20
Q

The later faces of a ___ ___ are congruent, isosceles triangles

A

Regular pyramids

21
Q

The height of each triangular lateral faces is called the ___ ___ of the pyramid

A

Slant height

22
Q

The radius of the cylinder is the ___ of the base

23
Q

The segment connecting the centers of the base is called the

24
Q

Is half a sphere and it’s circular base

A

Hemisphere

25
The circle that encloses the base of a hemisphere is called the ___ ___ of a sphere
Great circle
26
Is the digram of the surfaces of the three-dimensional figure that can be folded to form the three -dimensional figure
Net
27
Is the intersection of a three-dimensional figure and a plane
Cross section
28
Prism Number of faces
N+2
29
Prism Number of vertices
2n
30
Prism Number of edges
3n
31
Pyramid Number of faces
N+1
32
Pyramid Number of vertices
N+1
33
Pyramid Number of edges
2n
34
Euler's formula For any convex polyhedron, the number of faces, F, vertices, V, and edges, E, are related by the formula
F+V=E+2