

PERSAMAAN LINGKARAN DAN PERSAMAAN GARIS SINGGUNG
Presentation
•
Mathematics
•
1st Grade
•
Hard
Yayuk Badriatuz
FREE Resource
4 Slides • 0 Questions
1
By Yayuk Badriatuz
- Matematika Wajib Semester Genab -
2
Lingkaran adalah tempat kedududkan titik – titik yang berjarak sama (jari - jari linkaran) terhadap sebuah titik tertentu (pusat lingkaran) yang digambarkan pada bidang kartesius.
P (a ,b) = Pusat Lingkaran
r = jari-jari lingkaran
r = AP = BP = CP
3
Contoh
Tentukan persamaan lingkaran yang berpusat di O (0, 0) dan melaluititik A(3, 4
Penyelesaian
Karena berpusat di (0,0) dan melalui (3,4) maka nilai r :
x2+ y2 =r2
32+42 = r2
9+16 =r2
25 = r2
Jadi persamaan lingkaran berpusat di O (0, 0) dan melalui titik A(3, 4) adalah x2+ y2=25
4
Contoh
Tentukan persamaan lingkaran yang berpusat di O (0, 0) dan melaluititik A(3, 4
Penyelesaian
Karena berpusat di (0,0) dan melalui (3,4) maka nilai r :
x2+ y2 =r2
32+42 = r2
9+16 =r2
25 = r2
Jadi persamaan lingkaran berpusat di O (0, 0) dan melalui titik A(3, 4) adalah x2+ y2=25
x2+ y2= r2
By Yayuk Badriatuz
- Matematika Wajib Semester Genab -
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