Transcript Warm- Up 2/27/02 - Fulton County Schools

Warm- Up
1. Find the sine, cosine and
tangent of A.
2. Find x.
A
10
8
12
x
51°
6
Find the trigonometric ratios.
D
sin D =
cos D =
13
tan D =
5
sin G =
O
12
G
cos G =
tan G =
Find the missing variables.
12.9
x
43.2°
6 feet
25°
y
Finding an angle.
(Figuring out which ratio to use and getting to
use the 2nd button and one of the trig buttons.)
Let’s practice using the calculator!
Let A be an acute angle in a right triangle.
Approximate the measure of A to the
nearest degree
sinA=.36
cosA=.42
2nd
sin
.36
2nd
cos
.42
Ex. 1: Find . Round to four decimal places.
17.2
tan  
9
nd
2
tan 17.2
17.2

9

  62.3789
Make sure you are in degree mode (not radian).
9
Ex. 2: Find . Round to three decimal places.

23
7
7
cos  
23
nd
2
cos 7

  72.281
Make sure you are in degree mode (not radian).
23
Ex. 3: Find . Round to three decimal places.

200
nd
2
200
sin  
400
sin 200  400
  30
Make sure you are in degree mode (not radian).
When we are trying to find a side
we use sin, cos, or tan.
When we are trying to find an angle
we use sin-1, cos-1, or tan-1.