sphere carved fromcube of woodedge measure 20 cm howmuch cubic cm of wood must be carved away

A sphere is carved from a cube of wood whose edges measure 20 cm. How many cubic cm of wood must be carved away?

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I found the same answer but according to my maths text book it the answer is 7581 cm^3. (to the nearest cm^3) ??????!!!!!
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1 Answer

???????????? "meashuer 20" ?????????

???? du that meen leng av 1 side av kube=20 ??????

kube volume=20^3=8,000

spheer vol=(4/3)pi*radius^3

=(4/3)3.1415935*1000

=4,188.7902

differ=8,000-4,188.8

=3811.2
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