Download 8-4: Trigonometry

Geometry Warm-Up

2/6/12
The perimeter of a square is 20 inches.
Find the length of a side on the square
and the diagonal.
8-4: Trigonometry
Geometry
February 6, 2012
Trigonometry
Trigonometry – study of triangle
measurement
 3 Common Trig Ratios

Sine (sin)
 Cosine (cos)
 Tangent (tan)

Trig Ratios

The 3 trig ratios are all in reference to a
specific angle.
opposite
Sin 
hypotenuse
A
x
z
adjacent
Cos 
hypotenuse
opposite
Tan 
adjacent
B
C
y
Example 1
Find sin L, cos L, tan L, sin N, cos N, and tan N.
Express each ratio as a fraction and as a decimal.
“Gettin’ Triggy Wit It”