
Sudut Lebih Besar 360 derajat dan Sudut Negatif (6)
Presentation
•
Mathematics
•
10th Grade
•
Hard
putu tola
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9 Slides • 2 Questions
1
2
Menentukan nilai perbandingan trigonometri sudut-sudut yang berelasi dengan sudut lebih besar dari 360o
Menentukan nilai perbandingan trigonometri sudut-sudut yang berelasi dengan sudut negatif
3
Kita ketahui bahwa besar sudut dalam satu putaran lingkaran adalah 360o.
Jika kita mempunyai sudut yang besarnya lebih dari 360o ,maka sudut tersebut harus diubah terlebih dahulu sebagai berikut.
Sudut Lebih Besar 360o
4
Berapakah nilai sin 750o ?
5
Multiple Choice
Nilai dari cos 1500o adalah....
1
213
212
21
0
6
Sudut Negatif
Perhatikan gambar berikut ini!
P(x,y)
P'(x,-y)
X
Y
Q
O
7
P(x,y)
P'(x,-y)
X
Y
Q
O
(Searah jarum jam)
(Berlawanan arah jarum jam)
Terlihat bahwa:
8
P(x,y)
P'(x,-y)
X
Y
Q
O
Sehingga diperoleh
tanda (+)/(-) pada sin α, cos α, dan tan α dipengaruhi oleh letak sudut yang berada di kuadran IV
9
Contoh
sin (-45o) = -sin 45o
Nilai dari sin (-45o) adalah....
Jawab
10
Multiple Choice
Nilai cos (-225o) adalah....
-1
213
−212
21
0
11
Pembahasan
= cos (180o + 45o)
cos (-225o) = cos 225o
= -cos 45o
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