geometry b bellwork 3) using the inverse of tangent find m n to the nearest degree. tan n = = m n =...
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Geometry B Bellwork3) Using the inverse of tangentFind m N to the nearest degree.
tan N = = m N = tan-1(0.6) m N ≈ 31°
N
R X
30
18
18 30
0.6
9-2 Sine and Cosine Ratios
sin A =opposite side
hypotenuse
sin A = a
c
B c a
C b A
cos A =adjacent side
hypotenuse
cos A = b
c
B c a
C b A
EX. Write the sine and cosine ratio for A and B.
sin A =
cos A =
sin B =
cos B =
A
B
C
8 17
15
Before starting this problem change your calculator mode to degrees
EX 2. Find the value of w to the nearest tenth
cos =
5.1≈ w w32°
632° w 6
(6)cos 32°=w
1
CROSS
MULTIPLY
Before starting this problem change your calculator mode to degrees
Ex 3 . Find the value of w to the nearest tenth
sin =
7.1 ≈ w
w
52°
9
52° w 9
(9)sin52°=w
1
CROSS
MULTIPLY
Before starting this problem change your calculator mode to degrees
OYO….Find the value of w to the nearest tenth
sin =
8.6 ≈ ww
46°
12
46° w 12
(12)sin46°=w
1
CROSS
MULTIPLY
Before starting this problem change your calculator mode to degrees
EX 4. Find the value of w to the nearest tenth
cos =
w ≈ 10.7
w
62° 5
62° 5 w
cos62°(w)= 5
1
cos62° cos62°
CROSS
MULTIPLY
Before starting this problem change your calculator mode to degrees
OYO. Find the value of w to the nearest tenth
sin =
w ≈10.3
w
43°
743° 7
w
sin43°(w)= 7
1
sin43° Sin 43°
CROSS
MULTIPLY
EX. 5 Using the inverse of tangentFind m X to the nearest degree.
cos X = = m X = cos-1( ) m X ≈ 55°
N
R X
14
8
814
0.571428571
0.571428571
OYO….Using the inverse of tangentFind m X to the nearest degree.
sin X = = m X = sin-1( ) m X ≈ 43°
N
R X
1913
1319
0.684210526
0.684210526