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Whiteboardmaths.com
© 2004 - 2008 All rights reserved
Stand SW 100
Tregonmitri
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EXERCISES 2.1 Page 35
1)
135
12
Find the value of sin A , sin B , cos A , cos B , tan A , tan BB
AC
Answer Assignments
sin A = 13
5
13
1213
5sin B =
cos A = 13
12
cos B =
Tan A =
Tan B =
12
5
5
12
OK
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EXERCISES 2.1 Page 35
2)
1
1
Find the value of sin A , sin B , cos A , cos B , tan A , tan B
B
A
C
Answer Assignments
sin A = 2
1
2
12
1sin B =
cos A = 2
1
cos B =
Tan A =
Tan B =
1
1
2
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EXERCISES 2.1 Page 35
3)4
3
Find the value of sin A , sin B , cos A , cos B , tan A , tan B
B
A
C
5
Answer Assignments
sin A = 5
4
5
35
4sin B =
cos A = 5
3
cos B =
Tan A =
Tan B =
3
4
4
3
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EXERCISES 2.1 Page 35
4)
4
Find the value of sin A , sin B , cos A , cos B , tan A , tan B
B
A
C
5
41
Answer Assignments
sin A = 41
4
41
541
4sin B =
cos A = 41
5
cos B =
Tan A =
Tan B =
5
4
4
5
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EXERCISES 2.1 Page 35
From the image and value of tregonometry ratio find x of each following
AB
BCx sin)1
Answer Assignments
B
A
C
Opposite of A is BC
x = A
hyp
oppx sin
ok
ข้�ามฉาก
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EXERCISES 2.1 Page 35
From the image and value of tregonometry ratio find x of each following
AB
ACx sin)2
Answer Assignments
B
A
C
Opposite of B is AC
x = B
hyp
oppx sin
ok
ข้�าม
ฉาก
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EXERCISES 2.1 Page 35
From the image and value of tregonometry ratio find x of each following
AB
ACx cos)3
Answer Assignments
B
A
C
Adjacent of A is AC
x = A
hyp
adjx cos
ok
ชิ�ด
ฉาก
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EXERCISES 2.1 Page 35
From the image and value of tregonometry ratio find x of each following
AB
BCx cos)4
Answer Assignments
B
A
C
Adjacent of B is BC
x = B
hyp
adjx cos
ok
ชิ�ด
ฉาก
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EXERCISES 2.1 Page 35
From the image and value of tregonometry ratio find x of each following
BC
ACx tan)5
Answer Assignments
B
A
C
Opposite of B is AC
x = B
adj
oppx tan
ok
ข้�าม
ชิ�ด
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EXERCISES 2.1 Page 35
From the image and value of tregonometry ratio find x of each following
AC
BCx tan)6
Answer Assignments
B
A
C
ข้�าม
ชิ�ด
Opposite of A is BC
x = A
ok
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EXERCISES 2.1 Page 36
3. Find the tregonometry ratio
cb
B........).........4
ca
B...).........2
cb
A......).........3
ca
A....).........1
BA
C
c
ba
Answer Assignments
Sin
Cos
Cos
Sin
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Example
For the trigonometric tables find the value of trigonometry
055934sin.1
057455sin.2
331.477tan.3
883.062sin.4
259.075sin.5
625.032tan.6
ok
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Example
For the trigonometric tables find the value of trigonometry
?5.62sin.7
ok
Solution 883.062sin
891.063sin
มมข้อง sin เพิ่��มข้��น 1 องศา ค่�าเพิ่��มข้��น 0.891 – 0.883 = 0.008
มมข้อง sin เพิ่��มข้��น 0.5 องศา ค่�าเพิ่��มข้��น 004.01
008.05.0
ด�งน��น 887.0004883.05.62sin
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Example
For the trigonometric tables find the value of trigonometry
?5.32cos.7
ok
Solution 848.032cos
839.033cos
มมข้อง cos เพิ่��มข้��น 1 องศา ค่�าลดลง 0.848 – 0.839 = 0.009
มมข้อง cosเพิ่��มข้��น 0.5 องศา ค่�าลดลง 0045.01
009.05.0
ด�งน��น 8435.00045.0848.05.32cos
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Given the value of tregonometrytheFind
Example
,998.0sin 4
,927.0cos 22
,438.0sin 64
,732.3tan 75
,914.0sin 66
,391.0cos 67
ok
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Homework Page 36EXERCISES 2.1
4. Find the value of trigonometice32sin)1 4sin)2
81sin)3
29cos)517sin)4 18tan)6
81tan)7 5.51sin)85.67cos)9
5.42tan)10
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Homework Page 36EXERCISES 2.1
5.Determine the size of the A when sin A given to the following.
53.0)1 899.0)1
52
)3 85
)4
2315
)5
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