I'm not sure but i think its 6.4km per hour
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<em>Correction to your question text: diameter, not radius.</em>
The area of a circle is given by:

The radius is half of the diameter.

Substitute and solve.

Answer:
3.33lbs. repeating?
Step-by-step explanation:
I think it would just be 10/3 and be 3.33333333 and so on. (im just taking a guess)
No the answer is -13. Please mark me brainliest!