Geom8.3and8.4Part1Sides.notebook
April 08, 2014
Geometry
Ch.8 Notes Page 38
P38 8­3 The Tangent Ratio
8­4 Sine and Cosine Ratios (Part 1)
Feb 21­7:13 AM
Trigonometry
Sine, Cosine, and Tangent
Sin, Cos, and Tan on Graphing Calculator
(Calculators must be in Degree Mode)
Used to find Sides or Angles in a Right Triangle
c = hypotenuse
a
b
Feb 21­11:43 AM
1
Geom8.3and8.4Part1Sides.notebook
April 08, 2014
Trigonometry
Relationships of the Sides and angles
a
y
c
x
b
a is opposite of x
b is adjacent to x
b is opposite of y
a is adjacent to y
c is never considered opposite or adjacent
c is always called the Hypotenuse
Feb 21­11:47 AM
Apr 15­9:48 AM
2
Geom8.3and8.4Part1Sides.notebook
April 08, 2014
Trig Ratios
a
y
c
a
y
c
x
x
b
b
sin x = Opposite/Hypot
a/c
sin y = Opposite/Hypot
b/c
cos x = Adjacent/Hypot
b/c
cos y = Adjacent/Hypot
a/c
tan x = Opposite/Adjacent
a/b
tan y = Opposite/Adjacent
b/a
SOHCAHTOA
Feb 21­11:47 AM
Feb 21­7:46 AM
3
Geom8.3and8.4Part1Sides.notebook
April 08, 2014
Use the Triangle to find the Sin or Cos Ratio for each Angle...
Feb 21­7:50 AM
Feb 21­7:46 AM
4
Geom8.3and8.4Part1Sides.notebook
April 08, 2014
Find the value of the variable to the nearest tenth.
w
25
5
4)
35
15
5
22
w
w
Feb 21­7:48 AM
HW #44
8­3 and 8­4 Part1 WS
Please put your name and class period at the top of
the homework. Also include the homework number.
Terms:
Tangent
Sine
Cosine
Identity
Feb 21­7:12 AM
5
Geom8.3and8.4Part1Sides.notebook
April 08, 2014
Feb 21­7:46 AM
6