, yX 128.\r:L?@AZ[\:11*8+2=44 ( cm2 )\r]AZ[\:(11+22) x 10+2=165 ( cm?)\r^_`AZ[\44+165=209 ( cm2 )\rIabAZ[\:54x27=1458 ( mm2 )\rcAZ[\:(20+30 ) x 10+2=250 ( mmJ )\r29-1def?[\Y1450-250=1200 ( mma )\r"# $ % & ( 2 '( 10)\r30-K\r=3.14x16-3.14x9\r=314*(1 6 9 )\r=3.14x7\r=21.98 (cm 2 ) ;\r3g1M Yhi0BjZ[\X21.98cm2\r0 1 2 @ 1 3 @.\r)# * + , ' - 5 '( 2 3 \r .600+60020%=720 )k\nl7203%=2116 ) k\r32-1M YmnZopqrst720)k.vwmnxyz{p|21.6)k.\r130\r2200\r33-1 } 100\r126+3=42i\r176+4=44 i \r44>42~0B?Z\r44~Y2=2 Pi\r34-1M Y~l2i.\rK :
a+9+2Zi7X0 , a
5 ;\r . , 2 , . X 1 ,2+b+2Z
1 1 , ,b
7 ;\r
11&1 ,c
4 .\ra be =474\r35-1M Y?7abcX474 .\r36-1 YZ?7X'(7 .\r0 1 3 @ 1 3 @