Solve.1. n + 9 = 37

2. 6 = n – 20

3. 11n = 121

4. 7 =

n = 28

n = 26

n = 11

n = 49n 7

Do Now

3/10/15 8-1 A Points, Lines, & Planes

• point- an EXACT location that has no size– Named by a capital letter

• line- a straight path that has no thickness and extends forever– Named by 2 points on the line

• plane- a flat surface that has no thickness and extends forever– Named by 3 points on the plane that are not on

the same line

Example 1

A. three pointsM, N, and PFive points are labeled: points M, N, P, Q, and R.

B. two linesPR and NRYou can also write RP and RN.

Example 2

C. a point shared by two linespoint R

D. a planeplane QRMUse any three points in the plane that are not on the same line. Write the three points in any order.

Point R is a point on PR and NR.

• line segment- a part of a line made up of two endpoints and ALL points between them– Named by its endpoints

• ray- a part of a line that starts at an endpoint and extends forever in one direction– Named by the endpoint first and followed by

another point on the ray

Example 3

A. three different line segments

B. three ways to name the line

You can also write BA, CB, and CA.

AB, BC, and ACYou can also write BA, CB, and CA.

AB, BC, and AC C

A B

Example 4

C. six rays

D. another name for ray AB

A is still the endpoint. C is another point on the ray.

AB, AC, BC, CB,

CA, and BA

AC

C

A B

Use the diagram to name each geometric figure.1. three points

2. two lines

3. a point shared by a line and a ray

4. a plane

Possible answer: A, B, C

Possible answer: F

Possible answer: plane AEC

Possible answer: AD, CE

Exit Ticket

1. Use the diagram to name three points.

A. B. C. D. A, B, C

A

B

C

D

2. Use the diagram to name two lines.

A. B. C. D. A, B

A

B

C

D

3. Use the diagram to name a point shared by a line and a ray.

A. A B. B C. C D. D

A

B

CD

4. Use the diagram to name a plane.

A. plane PQT B. plane PT C. plane UTRD. plane QT T

Q

RU

P

S

Homework

• Pg. 443 #1-30 Evens