Quick Review

Use the figure at the right to decide whether the statement is true or false.

1. C lies on line d.

2) X, Y, and Z are collinear.

3) A is a plane.

4) CY is a line.

d

X

Y

CZ

A

1.4 Sketching Intersections

Vocabulary

Intersect- points in common

Intersection- point or points that two or more figures have in common

Postulates

Postulate 3- if two lines intersect, then their intersection is a point

-Lines s and t intersect at

point P.

Postulate 4- if two planes intersect, then their intersection is a line

-Planes M and N intersect

at line d.

P

s

t

M

N

d

EXAMPLES Use the diagram below.

1) Name the intersection of FJ and KM.

2) Name the intersection of NP and KM.

3) Name the intersection of NP and FJ.

FG

K

L

N M

H

P

J

4) Name the intersection of planes B and C.

5) Name the intersection of planes A and B.

6) Name the intersection of planes A and C.

C

A B

de

7) What is shown by this sketch?

8) Sketch two planes that intersect in a line.

D

a

Try in your notebooks

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