Hi Kaeruno,
The radius of the stool is 21 cm. To find the circumference, multiply this by 2 pi, since multiplying by 2 gives you the diameter and multiplying <em>that</em> by pi give the circumference.
2pi * 21cm
= pi * 2 * 21cm
= pi * 42cm
= (22/7) * 42cm
= 924/7 cm
= 132 cm.
The circumference is 132 cm.
If you have any further questions, feel free to message me!
Sincerely, taeuknam.
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What language is this so I can transalate and answer. If this even us a language
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