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-2021-2022-.1.18.84 A.3 B.6 C.92. A. B. C.3.2r A. B.r+r C.r+2r D.4.13 A.13 B.16 C.19 D.19.425. A. B. C. D.1. 2. 3.628cm2314cm 4. 5. .1.3 2. r =20cm100 3. 4. 5.1d= cm 2d= cm 3r= cm 4d= cm.1.1 2 .1.1582A903.1.8m1.57m 2.105 3.24 4.251.25.1.A2.C3.C4.C5.C.1.2.3.4.5.1.618.842.125.62203.14100=12560=125.63.4.r5.128.64.52.4.1.13412cm3.144212.5626.28cm6.28+1218.28cm3.141237.68dm2R5r3cm3.14523.14323.14253.1493.141650.24cm2h824dm8+1242204240dm23.1442250.24225.12dm240-25.12=14.88dm2.1.123.1.3.1481.57=25.121.57=16()162.3.141025=31.410=314()3143.244=6()3.14(62)=3.149=28.26()28.264.,1334.5282.6