Lena’s engagement ring has a radius of 9 millimeters. What is the ring’s circumference? Use 3.14 for ​

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1. Answer:

   Given – Radius of ring is 9 millimeters

   To find – Circumference

   Solution –

   9 millimeters = 0.9 centimeters

   Circumference of circle = 2 × pie × r

   = 2 × 3.14 × 0.9

   = 6.28 × 0.9

   = 5.652

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