We put a copper wire to wind around the circle whose dimeter is 30cm,just can be wound 12 rings,...We put a copper wire to wind around the circle whose dimeter is 30cm,just can be wound 12 rings,can you work out the length of the copper
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We put a copper wire to wind around the circle whose dimeter is 30cm,just can be wound 12 rings,...We put a copper wire to wind around the circle whose dimeter is 30cm,just can be wound 12 rings,can you work out the length of the copper
We put a copper wire to wind around the circle whose dimeter is 30cm,just can be wound 12 rings,...
We put a copper wire to wind around the circle whose dimeter is 30cm,just can be wound 12 rings,can you work out the length of the copper
We put a copper wire to wind around the circle whose dimeter is 30cm,just can be wound 12 rings,...We put a copper wire to wind around the circle whose dimeter is 30cm,just can be wound 12 rings,can you work out the length of the copper
先求周长=πd=3.14*30=94.2
铜线长为94.2*12=1130.4cm