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Write the equation of the circle containing the point (8, 1) and a center at (4, –9).

User B Best
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Answer:

(x -4)² +(y +9)² = 116

Explanation:

The standard form equation for a circle is ...

(x -h)² +(y -k)² = r² . . . . . . center at (h, k), radius r

The value of the r² term can be found by using the point in the circle expression.

(x -4)² +(y +9)² = (8 -4)² +(1 +9)² = 16 +100

(x -4)² +(y +9)² = 116 . . . . . equation of the circle

Write the equation of the circle containing the point (8, 1) and a center at (4, –9).-example-1
User Masha
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