Download Chapter 8.3: Trigonometric Ratios

Chapter 8.3: Trigonometric
Ratios
Introduction
• Trigonometry is a huge branch of
Mathematics. In Geometry, we touch on a
small portion. Called the “Trigonometric
Functions”. They are three formulas that
can be used to find the side lengths of
right triangles. They’re called:
• Sine, Cosine, and Tangent
Sin, Cos  , Tan  properties
• SIN  = length of the side opposite an angle
length of the hypotenuse
• COS = length of the adjacent side to an angle
length of the hypotenuse
• TAN  = length of the side opposite and angle
length of the side adjacent to an angle
 represent an Angle measure
Abbreviation
• Soh-Cah-Toa is a way to help you
memorize the trig. Formulas.
• SOH
Sin  = opp
hyp
• CAH
Cos = adj
hyp
• TOA
Tan = opp
adj
Defining Adjacent and Opposite
• Name the line segment:
C
– Adjacent to Angle A=
– Opposite to Angle A=
– Adjacent to Angle C=
– Opposite to Angle C=
A
B
How to read the Trig Table
Sin 34=
Cos 86=
Tan 57=
Classwork/Homework
• Pgs 434-435 #1-22 (potentially less)
• Pgs 441-442 #2-28e (potentially less)