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2009-05-18T20:04:05+02:00
R1 + r2 = 12
r1 - r2 = 3

2r1 = 15
r1 = 7,5

r2 = 12-r1 = 12 - 7,5 = 4,5

r1 = 7,5cm r2 = 4,5cm
2009-05-18T20:05:41+02:00
R1+r2=12 -> r2=12-r1
r1-r2=3

r1-(12-r1)=3
r1-12+r1=3
2r1=3+12
2r1=15
r1=7,5cm

r2=12-r1
r2=12-7,5
r2=4,5 cm