what is an angle? two different rays with the same endpoint. rays are the sides, endpoint is the...
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CHAPTER 1-4 (MEASURE AND CLASSIFY ANGLES) What is an
angle? Two different
rays with the same endpoint.
Rays are the sides, endpoint is the vertex.
Named with 3 points or by the vertex.
vertexsides
CHAPTER 1-4 (MEASURE AND CLASSIFY ANGLES) Example Name the angles
you see in the diagram
A
C
D
E
CHAPTER 1-4 (MEASURE AND CLASSIFY ANGLES) Measuring
angles with a protractor
Different types of angles:
Write either <ABC is 32º or m<ABC=32º
Acute (less than 90º)
Obtuse (more than 90º
Right angle (exactly 90º)
Straight (180º)
CHAPTER 1-4 (MEASURE AND CLASSIFY ANGLES) Example
Postulate 4: Angle Addition
Page 25 in textbook
If P is in the interior of <RST, then the measure of <RST is equal to the sum of the measures of <RSP and <PST
CHAPTER 1-4 (MEASURE AND CLASSIFY ANGLES) Example Given the
m<GFJ=155º, find m<GFH and m<HFJ
CHAPTER 1-4 (MEASURE AND CLASSIFY ANGLES) Example Given that <VRS
is a right angle, find m<VRT and m<TRS
CHAPTER 1-4 (MEASURE AND CLASSIFY ANGLES) Congruent
angles 2 angles are
congruent if they have the same measure (curved line)
<A <B
A
B
CHAPTER 1-4 (MEASURE AND CLASSIFY ANGLES) Example Identify all pairs
of congruent angles
If m<P=120º, what is m<N?
CHAPTER 1-4 (MEASURE AND CLASSIFY ANGLES) Angle Bisector A ray that
divides an angle into 2 angles that are congruent.
WY bisects <XWZ
CHAPTER 1-4 (MEASURE AND CLASSIFY ANGLES)Examples
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