Pre-Algebra Chapter 9
Pre-Algebra Chapter 9
Pre-Algebra Chapter 9
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Real Numbers and<br />
Right Triangles<br />
• Lessons 9-1 and 9-2 Find and use squares<br />
and square roots and identify numbers in the<br />
real number system.<br />
• Lessons 9-3 and 9-4 Classify angles and<br />
triangles and find the missing angle measure<br />
of a triangle.<br />
• Lessons 9-5 and 9-6 Use the Pythagorean<br />
Theorem, the Distance Formula, and the<br />
Midpoint Formula.<br />
• Lesson 9-7 Identify and use properties of<br />
similar figures.<br />
• Lesson 9-8 Use trigonometric ratios to solve<br />
problems.<br />
Key Vocabulary<br />
• angle (p. 447)<br />
• triangle (p. 453)<br />
• Pythagorean Theorem (p. 460)<br />
• similar triangles (p. 471)<br />
• trigonometric ratios (p. 477)<br />
All of the numbers we use on a daily basis are real numbers. Formulas<br />
that contain real numbers can be used to solve real-world problems<br />
dealing with distance. For example, if you know the height of a<br />
lighthouse, you can use a formula to determine<br />
how far you can see from the top of the<br />
lighthouse. You will solve a problem<br />
about lighthouses in Lesson 9-1.<br />
434 <strong>Chapter</strong> 9 Real Numbers and Right Triangles
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