第一个,
RB=AC=6
AS=CT=2R-AR-RC=2*6-8=4
SBT=1/4*6*2PI=3PI
SO, AC+CT+SBT+CR=10+3PI
第一个,
RB=AC=6
AS=CT=2R-AR-RC=2*6-8=4
SBT=1/4*6*2PI=3PI
SO, AC+CT+SBT+CR=10+3PI
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