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Mathematics
Mathematics
Problem
For the circle
(
x
−
4
)
2
+
(
y
+
1
)
2
=
81
(x - 4)^2 + (y + 1)^2 = 81
(
x
−
4
)
2
+
(
y
+
1
)
2
=
81
, the length of its diameter is a)
9
9
9
b)
2
17
2\sqrt{17}
2
17
c)
18
18
18
d)
81
81
81
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