Answer:
20.25 × pi cm²
Explanation:
the circumference of a circle is
2×pi×r
with r being the radius.
in our case
9×pi = 2×pi×r
9 = 2r
r = 9/2 = 4.5 cm
the area of a circle is
pi×r²
in our case that is
pi×(4.5)² = 20.25 × pi cm²
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