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Answer:
9. 4 in.
10. 1.6 ft
11. 6/5 cm
Explanation:
Diameter is pretty simple to find if you can remember this simple formula:
Diameter = 2 times the radius
(D=2r)
9. D = 2(2) = 4
10. D = 2(.8) = 1.6
11. D = 2 (3/5) = 6/5
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