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Mhd Yakub
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1
BAB 2
LINGKARAN
OLEH :
MOH. SYAHIDIN, S.Pd
(Guru Mateatika)
Jl. KH. Syukur No. 09 RT. 15 RW. 05 Desa Petung Kec. Panceng Kab. Gresik kode pos 61156
2
1. HUBUNGAN SUDUT PUSAT DAN SUDUT KELILING
• Sudut Pusat dibentuk oleh dua jari-jari
lingkaran
yang
berpotongandi
titik
pusatnya.
• Sudut Keliling adalah sudut yang dibentuk
oleh dua tali busur yang berpotongan di
satu titik pada keliling lingkaran.
• Perhatikan gambar disamping, OA dan OB
berpotongan di O membentuk sudut pusat
yaitu
∠ AOB. Adapun tali busur AC dan CB
berpotongan di titik C membentuk sudut
keliling ∠ ACB.
D. SUDUT PUSAT DAN SUDUT KELILING LINGKARAN
Sudut Keliling ∠ ACB
Sudut Pusat ∠ AOB
3
• Rumus Sudut Pusat dan Sudut Keliling :
Sudut Keliling ∠ ACB
Sudut Pusat ∠ AOB
Sudut Pusat AOB = 2 x ACB
Sudut Keliling ACB = 1
2x ∠ 𝐴𝑂𝐵
4
• Perhatikan Gambar disamping Sudut pusat AOB menghadap busur
AB. Perhatikan bahwa sudut keliling ACB dan sudut keliling ADB
menghadap busur AB, Maka diperoleh :
2. Besar Sudut Keliling yang Menghadap Diameter Lingkaran
5
6
3. Besar Sudut Keliling yang Menghadap Busur yang sama
7
8
4. Sudut Antara Dua Tali
Busur Jika Berpotongan
Di Dalam Lingkaran
9
10
5. Sudut Antara Dua Tali Busur Jika Berpotongan Di Luar Lingkaran
11
12
BAB 2
LINGKARAN
OLEH :
MOH. SYAHIDIN, S.Pd
(Guru Mateatika)
Jl. KH. Syukur No. 09 RT. 15 RW. 05 Desa Petung Kec. Panceng Kab. Gresik kode pos 61156
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