Answer:
The number in the green box should be 26.
Explanation:
This is not hard. You just apply the formula for the circumference of a circle.
C = 2 π r where r = radius. Here the radius is 13 so the circumference is
2* π * 13
= 26π (answer)
The radius is given, but the circumference is π times the diameter. The diameter is twice the radius, so is 26.
26 goes in the green box.
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