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Section 1.1 –. Do Now: What is geometry? Homework: Have class guidelines signed by Monday. Points, Lines, & Planes. The three building blocks of geometry are: Points Lines Planes. Points, Lines, & Planes. P. Collinear & Coplanar. Collinear means on the same line. Example:.

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section 1 1

Section 1.1 –

Do Now:

What is geometry?

Homework:

Have class guidelines signed by Monday

points lines planes
Points, Lines, & Planes

The three building blocks of geometry are:

  • Points
  • Lines
  • Planes
collinear coplanar
Collinear & Coplanar

Collinear means on the same line.

Example:

Coplanar means on the same plane

Example:

E

Points A, B, and C are collinear

D

F

Points D, E, and F are coplanar

collinear coplanar1
Collinear & Coplanar

Practice Problem

line segment
Line segment

Line Segment: Consists of two points called endpoints of the segment and all the point between them that are collinear with the two points.

Example:

How to Name It:

AB or BA

Line Segment

Endpoints

congruent segments
Congruent Segments

Congruent Segments: Two segments that have the same measure or length

Example: How to Name:

C

AC DC

3 cm

3 cm

means “is to congruent to”

A

D

midpoint
Midpoint
  • Bisects: Divides the segment into two congruent segments.
  • Midpointof a Segment: The point on the segment that is the same distance from both endpoints.

Example:

How to Name:

R

Q

P

R is the midpoint of

slide12
Ray
  • Ray: Begins at a point and extends infinitely in one direction.

Example: How to Name

- Need two letters

-First letter is the endpoint of the ray

-Second letter is any other point the ray

passes through

R

S

practice problems from textbook
Practice Problems From Textbook

Pg. 33 3-6, 8-9, 11, 18, 22-25, 27

closure
Closure
  • Write down three things that you learned today.