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```					  9-1 Introduction to Geometry

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Warm Up
California Standards
Lesson Presentation

Holt CA Course 1
9-1 Introduction to Geometry

Warm Up
What geometry term might you
associate with each object?
1. one edge of a cardboard box
line segment or line
2. the floor
plane or rectangle
3. the tip of a pen
point

Holt CA Course 1
9-1 Introduction to Geometry

Holt CA Course 1
9-1 Introduction to Geometry

Holt CA Course 1
9-1 Introduction to Geometry

Holt CA Course 1
9-1 Introduction to Geometry

Holt CA Course 1
9-1 Introduction to Geometry

Figures are congruent if they have the same shape
and size. Line segments are congruent if they have
the same length.
You can use tick marks to indicate congruent line
segments. In the illustration below, line segments
AB and BC are congruent.

Holt CA Course 1
9-1 Introduction to Geometry

Vocabulary
point
line
plane
ray
line segment
congruent

Holt CA Course 1
9-1 Introduction to Geometry
Additional Example 1: Identifying Points, Lines,
and Planes
Identify the figures in the diagram.

D
E
F

A. three points   D, E, and F   Choose any three points.
Choose any two points on
B. two lines      DE, DF        a line to name the line.
C. a plane        plane DEF     Choose any three points,
not on the same line to
name a plane.

Holt CA Course 1
9-1 Introduction to Geometry

Holt CA Course 1
9-1 Introduction to Geometry

Holt CA Course 1
9-1 Introduction to Geometry
Check It Out! Example 1
Identify the figures in the diagram.

G

H
I         F

A. four points    H, G, I, and F       Choose any four points.
Choose any two points on
B. two lines      IH, HF               a line to name the line.
Choose any three points,
C. a plane        plane IGF
not on the same line to
name a plane.

Holt CA Course 1
9-1 Introduction to Geometry

Holt CA Course 1
9-1 Introduction to Geometry

Holt CA Course 1
9-1 Introduction to Geometry

Holt CA Course 1

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