Berapakah jari-jari sari lingkaran berikut jika persamaan lingkaran x² +y² +10x +72= 0 * 5 poin
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x² + y² + 10x + 72 = 0
A = 10, B = 0, C = 72
P = ( -½A, -½B ) = ( -½.10, -½.0 ) = ( -5, 0 )
[tex]r = \sqrt{( - \frac{1}{2}a) {}^{2} + ( - \frac{1}{2} b) {}^{2} - c } \\ = \sqrt{( - 5) {}^{2} + 0 {}^{2} - 72 } \\ = \sqrt{25 + 0 - 72} \\ = \sqrt{ - 47} [/tex]
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