Pre-Algebra Chapter 9
Pre-Algebra Chapter 9
Pre-Algebra Chapter 9
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Learning Geometry Vocabulary<br />
Many of the words used in geometry are commonly used in everyday language. The<br />
everyday meanings of these words can be used to understand their mathematical<br />
meaning better.<br />
The table below shows the meanings of some geometry terms you will use<br />
throughout this chapter.<br />
Term Everyday Meaning Mathematical Meaning<br />
ray<br />
any of the thin lines, or beams,<br />
of light that appear to come from<br />
a bright source<br />
•a ray of light<br />
a part of a line that<br />
extends from a point<br />
indefinitely in one direction<br />
degree<br />
acute<br />
extent, amount, or relative intensity<br />
• third degree burns<br />
characterized by sharpness or<br />
severity<br />
• an acute pain<br />
a common unit of measure<br />
for angles<br />
an angle with a measure<br />
that is greater than 0° and<br />
less than 90°<br />
obtuse<br />
not producing a sharp impression<br />
• an obtuse statement<br />
an angle with a measure<br />
that is greater than 90° but<br />
less than 180°<br />
Source: Merriam Webster’s Collegiate Dictionary<br />
Reading to Learn<br />
1. Write a sentence using each term listed above. Be sure to use the everyday<br />
meaning of the term.<br />
2. RESEARCH Use the Internet or a dictionary to find the everyday meaning of<br />
each term listed below. Compare them to their mathematical meaning. Note any<br />
similarities and/or differences.<br />
a. midpoint b. converse c. indirect<br />
3. RESEARCH Use the Internet or dictionary to determine which of the following<br />
words are used only in mathematics.<br />
vertex equilateral similar scalene side isosceles<br />
446 <strong>Chapter</strong> 9 Real Numbers and Right Triangles<br />
446 Investigating
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