►A point is the place A point is the place where two lines where two lines intersect.intersect.

►We identify this We identify this point with a number point with a number or a CAPITAL letter.or a CAPITAL letter.

►A point has no A point has no length or width, it length or width, it just specifies an just specifies an exact location. exact location.

► The term The term intersect is intersect is used when used when lines, rays, lines, rays, line segments line segments or figures or figures meet, that is, meet, that is, they share a they share a common common point. point.

IN THIS CASE THE POINT OF INTERSECTION IS D

►A line is made up of infinite points. It A line is made up of infinite points. It has not endpoints and continues has not endpoints and continues endlessly on a plane.endlessly on a plane.

►Usually these lines are named with Usually these lines are named with lower cased letters such r,s,t…lower cased letters such r,s,t…

r

►We may think of a ray as a straight We may think of a ray as a straight line that begins at a certain point and line that begins at a certain point and extends forever in one direction.extends forever in one direction.

B

► It has a beginning point and an It has a beginning point and an endpointendpoint

A

B

►CURVED LINESCURVED LINES

rr1

PLANES- A plane is a two- dimensional surface.

- A plane can be defined by two parallel lines, two lines that cross one another or one point out of a straight line.

FF

G

A

r

s

r

s

r

- A plane has legnth and width but no thickness.

-It is like a flat surface that extends endlessly along its length and width.

- it is represented by a four- sided figure drawn in perspective.

EFF

G

F

G Q

- A plane is named with a script capital letter “ Q”.

- It may also be named using three points ( not on the same line) that lie on the plane, such G, F and E