+ 7 3 ® * \r5 1 -1 .1 28?;9IJ312.5&F#i5.\r :810x4x5=16200 C#5\r5 2 -1 ,1 29IJg16200C#5.\r'#?:'2012 - 7 *2 = 385\rIJ12*7 = 84C#i5\rC?:'2012 - 7 *2= 3845\r5 3 -1 . 2'#?9:'338 5 ,BHR384C#5 , q ? }9:'338=..\r16x (16+2 ) -3.14x (16+2 ) 2+2=2752 (C#5)\r54-1 2 9 SiWS27.52C#5.\r. : @ ;9I:'331.4cm ,I
331.4-3.14= 10(cm).\r55-11 289I
310\r :A;*9IJ`ge3.14x(18.84+3.14+2)2=2826(C#5),\r; A;*9¡tJ(¢R£9¤¥¦)g x2826x0.6+2826x2=62.172(§ 5 ) ,\r56-1¨©9 : 600x62.172=373032(ª).\r«gK3=210--180/=30° p zl=210°-180o=30, P z2=1800-30'=150'.\r57-1S e zl=30°, z2=150°, z3=30°.\r. :8+2=4(cm ) 6+2=3(cm )\r3.14x(42-32)\r=3.14x(16-9)\r=3.14x7\r=21.98 (cm2 )\r58-11 2jkl?9IJ321.98cm2.