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## 8.4 Trigonometry

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### Title: Trigonometry Author: Valued Customer Last modified by: Laura B. Koffman Created Date: 1/31/2007 10:49:40 PM Document presentation format: On-screen Show (4:3) – PowerPoint PPT presentation

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Title: 8.4 Trigonometry

1
8.4 Trigonometry
• Assignment 18 8.4 WB Pg. 103 1 14 all

2
Trigonometry
• The word trigonometry comes form the Greek words
that mean triangle measurement
• In trigonometry we will be finding the lengths of
the sides of Right triangles and the measures of
the acute angles.

A
• If you are looking at acute angle A then you
would name the sides represented in the diagram
to the left.

hypotenuse
C
B
opposite
3
Sine
• Sin A

A
hypotenuse
opposite
hypotenuse
opposite
A
4
Cosine
• Cos A

A
hypotenuse
opposite
hypotenuse
opposite
A
5
Tangent
• Tan A

A
hypotenuse
hypotenuse
opposite
opposite
A
6
Steps to Solve
• 1. Select your Reference Angle (must be acute)
• 2. Name the sides of the Triangle with regards
to the reference angle
• 3. Select the ratio you need to use
• Sine, Cosine, or Tangent
• 4. Write the equation to solve the problem
• Tan A Sin A Cos A
• 5. Solve

7
Find y correct to the nearest degree.
8
Find x if E is 24
9
Find x
10
Find y and K
B
y
l
5
K
L
12
11
Examples
• Find Tan X Tan Y