Warm up (draw each one)

1) Vertical line m intersects a horizontal plane M at point O.

2) Horizontal plane P contains two lines k and n that intersect at point A.

3) Vertical planes X and Y intersect at line AB.

4) Point P is not in plane N.

Segments A line with two endpoints. It consists of the two endpoints and

those points in between.

A

B

AB

ABLABEL

Rays A ray has one endpoint and extends out

endlessly in one direction. The endpoint (A) is always named first.

A

B

AB��������������LABEL

Number Line COORDINATE – number associated with a

letter Coordinate of M? Coordinate of J?

J A M

7

-4

Distance The distance of a segment = length LABEL JA = ? AM = ?

J A M

6 5

Segment Addition Postulate

If B is between A and C, then AB + BC = AC

A

B

C

CONGRUENCE CONGRUENT: two objects that have the same

size and shape

Congruent Segments: segments with equal lengths.

12.412.4

MIDPOINTMidpoint of a Segment: is the point that divides the segment into

two congruent segments.

BISECTOR

Bisector of a segment:

is a line, segment, ray, or plane that intersects the segment at its midpoint.

R

Y

C

A

Z

Find x if RA = 2x + 4, AY = 3x + 1,

and RY = 30.

2x + 43x + 1

30

2x + 4 + 3x + 1 = 305x + 5 = 30 - 5 - 55x = 25 /5 /5 x = 5

PRACTICE

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Classroom Exercises

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