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## Angles

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### Angles Acute Angle An angle that measures between 0 and 90 degrees. Right Angle An angle that measures 90 . Obtuse Angle An angle that measures between 90 and 180 ... – PowerPoint PPT presentation

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Title: Angles

1
Angles
2
Acute Angle
An angle that measures between 0 and 90 degrees.
3
Right Angle
An angle that measures 90?.
4
Obtuse Angle
An angle that measures between 90 and 180 degrees.
5
Straight Angle
An angle that measures 180?.
6
Reflex Angle
An angle with measure between 180 and 360 degrees.
7
Vertical Angles
Two angles across from each other when two lines
intersect.
8
Name 2 pairs of vertical angles.
?1 ?3 ?2 ?4
9
Perpendicular Lines
Two lines that intersect to form right angles.
10
Two angles that share a vertex and ray, but no
interior points (dont overlap).
11
Why?
a
s
b
r
12
Name 4 pairs of adjacent angles.
?1 ?2 ?2 ?3 ?3 ?4 ?1 ?4
13
Complementary Angles
Two angles with measures that add up to 90.
14
Find the value of y.
y
30?
y 90 - 30 60
15
Supplementary Angles
Two angles with measures that add up to 180.
16
Linear Pair of Angles
Two adjacent angles that form a line.
17
Find the value of x.
x 180 - 40 140
18
Find x and y.
x 60 y 180- 60 y 120
19
What would they measure?
20
What would they measure?
21
More Examples 1
(3x 2)?
x?
X 22
22
Example 2
(3x 6)?
2x?
X 34.8
23
Examples 3
• ? ABC and ? CBD form a right angle.
• m? ABC 3(m? CBD). How much does each angle
measure?

m? CBD 22.5 m? ABC 67.5
24
Example 4
• RST ? ? TSW
• m? RSW 95?

Each angle measures 47.5 degrees
25
Example 5
• RM bisects ? LRX.
• m ? LRM 6x 9
• m ? MRX 3x 12

26
Source
http//jwilson.coe.uga.edu/interMath/MainInterMath
/Dictionary/ http//access.selkirk.bc.ca/math/Mod
ule_4/Mod4_Pt1/mod4_pt1.html http//www.800score.
com/guidetc.html