Idiot\'s Guides Basic Math and Pre-Algebra

PA RT 3 The Shape of the World Any world tour must include seeing the sights, having a look at the shape of things. Whether it’s ...

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CHAPTER 12 Basics of Geometry ................................................................... In This Chapter The vocabular ...

152 Part 3: The Shape of the World Points, Lines, Planes, and Angles The undefined terms of geometry are a curious mix of things ...

Chapter 12: Basics of Geometry 153 Basic Geometry Terms Before your imagination is completely exhausted, let’s look at some part ...

154 Part 3: The Shape of the World In the angle ’XYZ, the vertex is Y, and the sides are rays YX and YZ. You can name angles by ...

Chapter 12: Basics of Geometry 155 A number line like this can be used to measure line segments. For example, the length of line ...

156 Part 3: The Shape of the World When two segments have the same length, they are called congruent segments. In symbols, you c ...

Chapter 12: Basics of Geometry 157 Two angles whose measurements total to 180r are called supplementary angles. If two angles ar ...

158 Part 3: The Shape of the World Angles ’RPQ and ’SPQ are adjacent. Angles ’ABD and ’CBD are both adjacent and linear. P R Q S ...

Chapter 12: Basics of Geometry 159 DEFINITION The midpoint of a line segment is a point on the segment that divides it into two ...

160 Part 3: The Shape of the World DEFINITION Lines, rays or segments that meet to form a right angle are perpendicular. Paralle ...

Chapter 12: Basics of Geometry 161 Look at only the angles that are between the parallel lines, ’3, ’4, ’5, and ’6. Choose one f ...

162 Part 3: The Shape of the World Slopes Geometry and algebra may feel like different worlds at times, but now and then, they c ...

Chapter 12: Basics of Geometry 163 -6 -2 062 -2 2 4 6 -4 -6 -8-9 -7 -5 -4 -1-3 134 5 78 9 -8 -9 -1 -3 -5 -7 8 9 1 3 5 7 -10 10 - ...

164 Part 3: The Shape of the World The Least You Need to Know Midpoints and bisectors divide segments into two congruent segmen ...

CHAPTER 13 Triangles ...................................................................................... In This Chapter Cla ...

166 Part 3: The Shape of the World Facts about Triangles A polygon is a figure formed by connecting line segments at their endpo ...

Chapter 13: Triangles 167 You can bisect any one of the angles in a triangle. The line segment from the vertex to the opposite s ...

168 Part 3: The Shape of the World In most triangles, the altitude, the angle bisector, and the median from a vertex are all dif ...