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Anonymous
reinforced cement concrete
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It is in its simplest form: 4r+r = 5r
S
C = 2*pi*r 8 = 2*pi*r 4 = pi*r r = 4/pi
C-I-R-C-U-L-A-R-C-E-N-T-I-P-E-D-E-U-N-D-E-R-A-B-E-A-C-H-U-M-B-R-E-L-L-A