Question

0

The circumference of a circle is 21.3mm.
Find the length of the radius.
Give your answer rounded to 1 DP
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Answer 1

r =3.4 mm

Explanation:

circumference of a circle = 2πr

21.3 = 2*3.14*r

21.3 = 6.28*r

21.3 / 6.28 = r

3.39 = r

3.4 = r