Prentice Hall Geometry

Selected Answers

Chapter 1

Get Ready! p. 1

1. 9 2. 16 3. 121 4. 37 5. 78.5 6. 13 7. 1 8. negative , 3 fifths 9. 5 10. 8 11. 4 12. 3 13. 3 14. 6 15. 1 16. Answers may vary. Sample: building or making a geometric object, possibly involving several steps 17. Answers may vary. Sample: a point that falls exactly in the middle of a geometric object 18. Answers may vary. Sample: a type of line that has a source and no ending point 19. Answers may vary. Sample: part of the same line

Lesson 1-1 pp. 4–10

Got It? 1. E, C

2a. Answers may vary. Sample:

A net has a horizontal rectangle of length 7 centimeters and height 4 centimeters in the center, with rectangles of length 10 centimeters on each width side and triangles with sides 10 centimeters on each length side.

b. Yes; answers may vary. Sample:

A net has a vertical rectangle with length 7 centimeters and width 4 centimeters, with triangles with other two sides measuring 10 centimeters on each length side. The triangle on the right has rectangles of width 4 centimeters on each 10-centimeter side.

3. An isometric drawing has two cubes with sides facing front, right, and up, with a cube on top between them.

4.   An orthographic drawing displays three views.
Image Long Description

Lesson Check

1. Answers may vary. Sample:

A net has a stack of horizontal rectangles of length 5 inches, the top and third with height 2 inches and second and bottom with height 1 inch. The third has rectangles of width 1 inch on each side.

2. An isometric drawing has a cube at the front, in front of the left side of a stack of cubes with three on the left, two in the middle, and one on the right.

3. An orthographic drawing has top view containing five squares, one in the middle with four on each side. The front and right views each have a row of three squares with one top of the middle.

4a. net b. orthographic c. isometric d. none 5. Answers may vary. Sample: In an isometric drawing, you see three sides of a figure from one corner view. In an orthographic drawing, you see three separate views of the figure. In both drawings, you see the same three sides of the figure (top, front, and right). Also, both drawings represent a three-dimensional object in two dimensions.

Exercises 7. A

9. Answers may vary. Sample:

A net has a row of vertical rectangles of height 4 inches and width 2 inches. The second rectangle has squares on each width side.

11. Answers may vary. Sample:

A net has a row of six rectangles of height 30 millimeters, the third and last with width 36 millimeters and remaining four with width 12 millimeters. The third has hexagons on each width side, each with two sides 36 millimeters and four sides 12 millimeters.

13. An isometric drawing has a square to the front, connected to a box extending four squares back, with a cube on top of the back, a box extending two squares from the right back to a square at the right, and a cube between the front and right boxes.

15.   An isometric drawing contains various shapes.
Image Long Description

17. An orthographic drawing has top and front views containing a stack of three squares and right view as a staircase-shaped polygon, rising from left to right.

19.   An orthographic drawing displays three views.
Image Long Description

21a. Answers may vary. Sample:

An isometric drawing has eight squares in stacks of two, spanning two from front to back and two from right to left, meeting along an edge in the middle.

b.   An orthographic drawing displays three views.
Image Long Description


End ofPage 895

Table of Contents

Prentice Hall Geometry
Contents in Brief
Series Authors
Consulting Authors
Program Authors
Reviewers National
From the Authors
PowerGeometry.com
Big Ideas
Exploring Concepts
Thinking Mathematically
Active Learning
Practice Makes Perfect
Pearson Video Challenge
Acing the Test
BIG ideas
Entry-Level Assessment
Chapter 1 Tools of Geometry
Get Ready!
1-1 Nets and Drawings for Visualizing Geometry
1-2 Points, Lines, and Planes
1-3 Measuring Segments
1-4 Measuring Angles
1-5 Exploring Angle Pairs
1 Mid-Chapter Quiz
Concept Byte: Compass Designs
1-6 Basic Constructions
Concept Byte: Exploring Constructions
1-7 Midpoint and Distance in the Coordinate Plane
Review: Classifying Polygons
1-8 Perimeter, Circumference, and Area
Concept Byte: Comparing Perimeters and Areas
1 Pull It All Together
1 Chapter Review
1 Chapter Test
1 Cumulative Test Prep
Chapter 2 Reasoning and Proof
Get Ready!
2-1 Patterns and Inductive Reasoning
2-2 Conditional Statements
Concept Byte: Logic and Truth Tables
2-3 Biconditionals and Definitions
2 Mid-Chapter Quiz
2-4 Deductive Reasoning
2-5 Reasoning in Algebra and Geometry
2-6 Proving Angles Congruent
2 Pull It All Together
2 Chapter Review
2 Chapter Test
2 Cumulative Test Prep
Chapter 3 Parallel and Perpendicular Lines
Get Ready!
3-1 Lines and Angles
Concept Byte: Parallel Lines and Related Angles
3-2 Properties of Parallel Lines
3-3 Proving Lines Parallel
3-4 Parallel and Perpendicular Lines
Concept Byte: Perpendicular Lines and Planes
3-5 Parallel Lines and Triangles
Concept Byte: Exploring Spherical Geometry
3 Mid-Chapter Quiz
3-6 Constructing Parallel and Perpendicular Lines
3-7 Equations of Lines in the Coordinate Plane
3-8 Slopes of Parallel and Perpendicular Lines
3 Pull It All Together
3 Chapter Review
3 Chapter Test
3 Cumulative Test Prep
Chapter 4 Congruent Triangles
Get Ready!
4-1 Congruent Figures
Concept Byte: Building Congruent Triangles
4-2 Triangle Congruence by SSS and SAS
4-3 Triangle Congruence by ASA and AAS
Concept Byte: Exploring AAA and SSA
4 Mid-Chapter Quiz
4-4 Using Corresponding Parts of Congruent Triangles
Concept Byte: Paper-Folding Conjectures
4-5 Isosceles and Equilateral Triangles
Algebra Review: Systems of Linear Equations
4-6 Congruence in Right Triangles
4-7 Congruence in Overlapping Triangles
4 Pull It All Together
4 Chapter Review
4 Chapter Test
4 Cumulative Test Prep
Chapter 5 Relationships Within Triangles
Get Ready!
Concept Byte: Investigating Midsegments
5-1 Midsegments of Triangles
5-2 Perpendicular and Angle Bisectors
Concept Byte: Paper Folding Bisectors
5-3 Bisectors in Triangles
Concept Byte: Special Segments in Triangles
5-4 Medians and Altitudes
5 Mid-Chapter Quiz
5-5 Indirect Proof
Algebra Review: Solving Inequalities
5-6 Inequalities in One Triangle
5-7 Inequalities in Two Triangles
5 Pull It All Together
5 Chapter Review
5 Chapter Test
5 Cumulative Test Prep
Chapter 6 Polygons and Quadrilaterals
Get Ready!
Concept Byte: Exterior Angles of Polygons
6-1 The Polygon Angle-Sum Theorems
6-2 Properties of Parallelograms
6-3 Proving That a Quadrilateral Is a Parallelogram
6-4 Properties of Rhombuses, Rectangles, and Squares
6-5 Conditions for Rhombuses, Rectangles, and Squares
6-6 Trapezoids and Kites
6 Mid-Chapter Quiz
Algebra Review: Simplifying Radicals
6-7 Polygons in the Coordinate Plane
6-8 Applying Coordinate Geometry
Concept Byte: Quadrilaterals in Quadrilaterals
6-9 Proofs Using Coordinate Geometry
6 Pull It All Together
6 Chapter Review
6 Chapter Test
6 Cumulative Test Prep
Chapter 7 Similarity
Get Ready!
7-1 Ratios and Proportions
Algebra Review: Solving Quadratic Equations
7-2 Similar Polygons
Concept Byte: Fractals
7-3 Proving Triangles Similar
7 Mid-Chapter Quiz
7-4 Similarity in Right Triangles
Concept Byte: The Golden Ratio
Concept Byte: Exploring Proportions in Triangles
7-5 Proportions in Triangles
7 Pull It All Together
7 Chapter Review
7 Chapter Test
7 Cumulative Test Prep
Chapter 8 Right Triangles and Trigonometry
Get Ready!
Concept Byte: The Pythagorean Theorem
8-1 The Pythagorean Theorem and Its Converse
8-2 Special Right Triangles
Concept Byte: Exploring Trigonometric Ratios
8-3 Trigonometry
8 Mid-Chapter Quiz
Concept Byte: Measuring From Afar
8-4 Angles of Elevation and Depression
Concept Byte: Law of Sines and Law of Cosines
8-5 Vectors
8 Pull It All Together
8 Chapter Review
8 Chapter Test
8 Cumulative Test Prep
Chapter 9 Transformations
Get Ready!
9-1 Translations
Concept Byte: Paper Folding and Reflections
9-2 Reflections
9-3 Rotations
Concept Byte: Tracing Paper Transformations
9-4 Symmetry
9 Mid-Chapter Quiz
9-5 Dilations
Concept Byte: Transformations Using Vectors and Matrices
9-6 Compositions of Reflections
Concept Byte: Frieze Patterns
Concept Byte: Creating Tessellations
9-7 Tessellations
9 Pull It All Together
9 Chapter Review
9 Chapter Test
9 Cumulative Test Prep
Chapter 10 Area
Get Ready!
Concept Byte: Transforming to Find Area
10-1 Areas of Parallelograms and Triangles
10-2 Areas of Trapezoids, Rhombuses, and Kites
10-3 Areas of Regular Polygons
10-4 Perimeters and Areas of Similar Figures
10 Mid-Chapter Quiz
10-5 Trigonometry and Area
10-6 Circles and Arcs
Concept Byte: Circle Graphs
Concept Byte: Exploring the Area of a Circle
10-7 Areas of Circles and Sectors
Concept Byte: Exploring Area and Circumference
10-8 Geometric Probability
10 Pull It All Together
10 Chapter Review
10 Chapter Test
10 Cumulative Test Prep
Chapter 11 Surface Area and Volume
Get Ready!
11-1 Space Figures and Cross Sections
Concept Byte: Perspective Drawing
Algebra Review: Literal Equations
11-2 Surface Areas of Prisms and Cylinders
11-3 Surface Areas of Pyramids and Cones
11 Mid-Chapter Quiz
11-4 Volumes of Prisms and Cylinders
Concept Byte: Finding Volume
11-5 Volumes of Pyramids and Cones
11-6 Surface Areas and Volumes of Spheres
Concept Byte: Exploring Similar Solids
11-7 Areas and Volumes of Similar Solids
11 Pull It All Together
11 Chapter Review
11 Chapter Test
11 Cumulative Test Prep
Chapter 12 Circles
Get Ready!
12-1 Tangent Lines
Concept Byte: Paper Folding With Circles
12-2 Chords and Arcs
12-3 Inscribed Angles
12 Mid-Chapter Quiz
Concept Byte: Exploring Chords and Secants
12-4 Angle Measures and Segment Lengths
12-5 Circles in the Coordinate Plane
12-6 Locus: A Set of Points
12 Pull It All Together
12 Chapter Review
12 Chapter Test
End-of-Course Assessment
Skills Handbook
Using a Ruler and Protractor
Classifying Triangles
Measurement Conversions
Measurement, Rounding Error, and Reasonableness
The Effect of Measurement Errors on Calculations
Squaring Numbers and Finding Square Roots
Evaluating and Simplifying Expressions
Simplifying Ratios
Absolute Value
The Coordinate Plane
Solving and Writing Linear Equations
Percents
Probability
Reference
Table 1 Measures
Table 2 Formulas
Table 3 Reading Math Symbols
Table 4 Properties of Real Numbers
Postulates, Theorems, and Constructions
Visual Glossary
Selected Answers
Index
Acknowledgments
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