Answer:
Diameter = 36
Radius = 18
Equation is (x - 4)² + (y - 9)² = 18²
Step-by-step explanation:
circumference = πd
36π = πd
divide both sides by π
d = 36
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Radius = d/2
r = 36/2 = 18
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Standard form is
(x - h)² - (y - k)² = r²
(h, k) is the center and r is the radius
Using (h, k) = (4, 9) and r = 18
(x - 4)² + (y - 9)² = 18²
