The circumference of a circle is 18.1mm. Find the length of the radius. Give your answer rounded to 1 DP.
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Answer:
r = 3
Step-by-step explanation:
circumference of the circle= 2πr
18.1 = 2 × 22/7 × r
18.1 × 7 = 44 × r
126.7 = 44r
r = 126.7/44
r = 2.87
r = 3
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