Answer:
18/π
Explanation:
Since 2 × π × r is the circumference of the circle,
2πr = 18
πr = 9
r = 9/π
Since the diameter is 2x the radius,
2r = d
2 × 9/π = d
18/π = d
Around 5.73. The exact answer is 18/pi. Why? The diameter is twice the radius (2r) The formula of the circumference if 2 pi R
if we divide 18, the circumference by pi, we get the diameter.
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