Definitions Chap. 2

Question 0

Closed curve

Answer 0

Begins and ends at the same point. ⭕️

Question 1

Triangle

Answer 1

Union of segments looks like Δ

Question 2

Simple curve

Answer 2

Doesn’t intersect itself C

Question 3

Simple closed curve

Answer 3

Closed and simple curve

Question 4

Circle

Answer 4

Set of all points that are a given distance from a given point in a given plane.

Question 5

Center

Answer 5

Given point in the plane

Question 6

Radius of a circle

Answer 6

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

Question 7

Chord of a circle

Answer 7

A segment having both end points on the circle

Question 8

Diameter

Answer 8

A chord that passes through the center of the circle

Question 9

Arc

Answer 9

A curve that is a subset of a circle

Question 10

Interior of a circle

Answer 10

Set of all planar points whose distance from the center of the circle is the length of the radius

Question 11

Exterior of a circle

Answer 11

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

Question 12

Jordan curve thereom

Answer 12

Any simple closed curve divides itself into 3 the curve, interior and exterior

Question 13

Half line

Answer 13

Set of all points on a line on a given side of a given point of the line

Question 14

Ray

Answer 14

The union of the half line and its origin. It extends infinitely in one direction from a point