Chapter 2 Vocabulary

Question 0

What is a ray?

Answer 0

The union of a half line and it’s origin. It extends infinitely in one direction form a point

Question 1

What is a half line?

Answer 1

The set of all points on a line on a given side of a given point of the line

Question 2

What does between mean?

Answer 2

In an intervening position, separating

Question 3

What is a segment?

Answer 3

The set consisting of two points and all the points in between

Question 4

What is a half plane?

Answer 4

A subset of a plane consisting of all points on a given side of a line in the plane

Question 5

What is an edge of a half plane?

Answer 5

The line that separates the plane into two half-planes. The line is not part of either half-plane.

Question 6

What are opposite half-planes?

Answer 6

The two half-planes that are separated by a particular line of the plane.

Question 7

What is an angle?

Answer 7

The union of two distinct rays with a common endpoint

Question 8

What are the sides of an angle?

Answer 8

The two rays that form the angle

Question 9

What is the vertex of an angle?

Answer 9

The common endpoint (origin) of the two rays

Question 10

What is a triangle?

Answer 10

The Union of segments that connect three no collinear points

Question 11

What is a closed curve?

Answer 11

A curve that begins and ends at the same point

Question 12

What is a simple curve?

Answer 12

A curve that does not intersect itself

Question 13

What is a simple closed curve?

Answer 13

A simple curve that is also a closed curve

Question 14

What is a circle?

Answer 14

The set of all points that are given distance from a given point in a plane

Question 15

What is the center of a circle?

Answer 15

The given point in the plane

Question 16

What is the radius of the circle?

Answer 16

A segment that connects a point on the circle with the center

Question 17

What is the chord of a circle?

Answer 17

A segment having both endpoint a on the circle

Question 18

What is a diameter?

Answer 18

A chord that passes through the center of the circle

Question 19

What is an arc?

Answer 19

A curve that is a subset of a circle

Question 20

What is an interior of a circle?

Answer 20

The set of,all planar points whose distance from the center of the circle is less than the length of the radius

Question 21

The exterior of an angle?

Answer 21

The set of all planar points whose distance from the center is greater than the length of the radius

Question 22

What is a region?

Answer 22

The union of a simple closed curve and its interior

Question 23

What is a convex?

Answer 23

The set that has the property that any two of its points determine a segment contained in the set

Question 24

What is concave?

Answer 24

A set that is not convex

Question 25

What is a polygon?

Answer 25

A simple closed curve that consists only of segments

Question 26

What is the side of a polygon?

Answer 26

One of the segments that define the polygon

Question 27

What is a vertex of a polygon?

Answer 27

An endpoint of a side of the polygon

Question 28

What is the angle of a polygon?

Answer 28

An angle with two properties: it's vertex is a vertex of the polygon and each side of the angle contains a side of the polygon

Question 29

What is a surface?

Answer 29

A connected set of points in space having only the thickness of a point

Question 30

What is a sphere?

Answer 30

A surface in space consisting of the set of all points at a given distance from the given point

Question 31

What is the center of a sphere?

Answer 31

A given point

Question 32

What is radius?

Answer 32

A segment that connects a point of the sphere with the center

Question 33

What is a closed surface?

Answer 33

A surface with a finite size that divides other points in space into an interior and an exterior

Question 34

What is a cone?

Answer 34

The union of a region and all segments that connect the boundary of the region with a specific non coplanar point

Question 35

What is a cylinder?

Answer 35

The union of two regions of the same size and shape in different parallel planes, and the set of all segment that join corresponding points on the boundaries of the regions

Question 36

What is a prism?

Answer 36

A cylinder with polygonal regions as bases

Question 37

What is a pyramid?

Answer 37

A cone with a polygonal region as its base

Question 38

What is a regular polyhedron?

Answer 38

A convex polyhedron having having two properties