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scoundrel [369]
4 years ago
12

Write the equation in standard form for the circle with center (9, - 4) and radius 9.

Mathematics
1 answer:
Sophie [7]4 years ago
4 0

Answer:

(x-9)^{2}+(y+4)^{2}=81

Step-by-step explanation:

we know that

The equation of a circle in standard form is equal to

(x-h)^{2}+(y-k)^{2}=r^{2}

where

(h,k) is the center

r is the radius

In this problem we have

(h,k)=(9,-4)

r=9\ units

substitute

(x-9)^{2}+(y+4)^{2}=9^{2}

(x-9)^{2}+(y+4)^{2}=81 ----> equation of the circle in standard form

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