6th Grade Math Textbook, Fundamentals

viii

Chapter

Two-Dimensional

Geometry

Chapter Opener....................... 239

9-1 Points, Lines, and Planes........... 240

9-2 Classify and Measure Angles........ 242

9-3 Angle Pairs................ 244

9-4 Parallel Lines and
Transversals..................... 246

9-5 Congruent Angles and
Line Segments................... 248

9-6 Line Constructions................ 250

Check Your Progress I (Lessons 1–6)

9-7 Polygons.................. 252

9-8 Triangles.................. 254

9-9 Congruent Triangles......... 256

9-10 Triangle Constructions............. 258

Check Your Progress II (Lessons 7–10)

9-11 Quadrilaterals.................... 260

9-12 Circles......................... 262

9-13 Make a Circle Graph.............. 264

Check Your Progress III (Lessons 11–13)

9-14 Problem-Solving Strategy:
Adopt a Different Point of View....... 266
Enrichment:
Quadrilaterals from Quadrilaterals.... 268
Test Prep....................... 270

Chapter

Two-Dimensional

Geometry and

Measurement Applications

Chapter Opener....................... 271

10-1 Precision and Accuracy

in Measurement.................. 272

10-2 Perimeter.................. 274

10-3 Squares and Square Roots.... 276

10-4 Irrational Numbers........... 278

10-5 Pythagorean Theorem........ 280

Check Your Progress I (Lessons 1–5)

10-6 Area of Parallelograms....... 282

10-7 Area of Triangles

and Trapezoids................... 284

10-8 Circumference and Area

of a Circle....................... 286

Check Your Progress II(Lessons 6–8)

10-9 Area of Complex Figures...... 288

10-10Symmetry....................... 290

10-11 Tessellations..................... 292

Check Your Progress III (Lessons 9–11)

10-12Technology:

Relate Perimeter and Area.......... 294

10-13Problem-Solving Strategy:

Account for All Possibilities.......... 296

Enrichment:

Area of Irregular Polygons.......... 298

Test Prep....................... 300