Download 7.6 Notes

Warm-Up
BellExercises
Work
Use this diagram for Exercises 1-4.
1. Name the hypotenuse.
2. Name the leg opposite
X.
Warm-Up
Exercises
Notes
Sine and Cosine Ratios
Warm-Up1Exercises
EXAMPLE
Find sin S and sin R. Write each answer as a fraction
and as a decimal rounded to four places.
Warm-Up
Exercises
GUIDED
PRACTICE
for Example 1
Find sin X and sin Y. Write each answer as a fraction
and as a decimal. Round to four decimal places, if
necessary.
Warm-Up2Exercises
EXAMPLE
Find cos U and cos W. Write each answer as a fraction
and as a decimal.
Warm-Up3Exercises
EXAMPLE
You want to string cable to make a dog run from two
corners of a building, as shown in the diagram. Write
and solve a proportion using a trigonometric ratio to
approximate the length of cable you will need.
Warm-Up
Exercises
GUIDED
PRACTICE
In Exercises 3 and 4, find cos R and cos S.
Warm-Up
Exercises
Notes
Angle of Elevation and Angle of Depression
Warm-Up4Exercises
EXAMPLE
You are skiing on a mountain with an altitude of 1200
meters. The angle of depression is 21o. About how far
do you ski down the mountain?
Warm-Up5Exercises
EXAMPLE
You want to build a skateboard ramp with a length of
14 feet and an angle of elevation of 26°. You need to
find the height and length of the base of the ramp.
Warm-Up6Exercises
EXAMPLE
Use a special right triangle to find the sine and cosine
of a 60o angle.
Warm-Up6Exercises
EXAMPLE
Use a special right triangle to find the sine and cosine
of a 30o angle.
Daily
Homework
Warm-Up
Exercises
Quick
CheckQuiz
Use this diagram for Exercises 1- 3.
1.
If x = 4 5 , y = 4 and z = 4 6 , find sin X, sin Y, cos X
and cos Y.
Daily
Homework
Warm-Up
Exercises
Quick
CheckQuiz
Use this diagram for Exercises 1- 3.
2.
If y = 10 and m
o
Y = 15 , find z to the nearest tenth.
Daily
Homework
Warm-Up
Exercises
Quick
CheckQuiz
Use this diagram for Exercises 1- 3.
3.
If z = 12 and m
o
X = 84 , find y to the nearest tenth.
Daily
Homework
Warm-Up
Exercises
Quick
CheckQuiz
4.
A lamppost is 11 feet tall. If the angle of elevation of
the sun is 49o , how far is the top of the lamppost
from the tip of its shadow?
Warm-Up
Exercises
For Tomorrow
Homework
HW: 7.6 (pg. 471-473) #4,6,8,12,16,33,34