Odpowiedzi

2010-03-16T15:59:38+01:00
2r1=38mm /:2
r1=19
P1=pir2
P1=3.14*19*19
P1=3.14*361
P1=1133.54mm2


2r2=40mm /:2
r2=20mm
P2=3.14*20*20
P2=3.14*400
P2=1256


P1:P2=1133,54:1256=0.9025