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Do Now
 Take your assigned graphing calculator
 Put your 12.1 worksheet on your desk to be stamped.
 Solve for h.
Problem Solving with
Right Triangles
Today’s Objectives
 Use trigonometry to solve applied problems.
 Apply inverse trigonometry.
 Use problem solving skills.
Angles
 Angle of elevation—the angle from the horizontal to your line
of sight when you look up.
 Angle of depression—the angle from the horizontal to your
line of sight when you look down.
Example
 The angle of elevation from a sailboat to the top of a 121-foot
lighthouse on the shore measures 16o. How far is the sailboat
from the lighthouse?
Practice
 Valery is flying a kite directly over her friend Fernando, who is
125 meters away. When she holds the kite string down to the
ground, the string makes a 39o angle with the level ground.
How high is Valery’s kite?
Practice
Today’s Objectives
 Use trigonometry to solve applied problems.
 Apply inverse trigonometry.
 Use problem solving skills.
Exit Slip
 For the following problems, show your work and explain your
reasoning.
1.
Solve for a.
a
17 cm
320
2.
The angle of elevation from a ship to the top of a 42-meter
lighthouse on the shore measures 33o. How far is the ship
from the lighthouse? (Assume the horizontal line of sight
meets the bottom of the lighthouse.)