.\r1 2 % & 1 4 %.\r !2 4 0 x lx ? = 60(W)\r3 4\r3 0 -1 ,: !YZ[\^$ +60W.\r :3.14 (20+2 ) 2*22+3.14X (20+2 ) 2 3\r= 3.14 x 100 x (22+3)\r= 3.14x100x25\r=7850 ( ^ _ )\r7850` /JS* = 7.85a\r31-1: !%bcdeefghij7.85a.\rZ [ \ ] ^ _ ` a b ^\r / !\rc'dce ~ ( 1 0 12\rf [ \ ] ^ g ` a b h\rijklme\r60004-12\rZ Jfn[o?p`ab 6000 + (6 0 00+ 10\r^qArste 4-60004-12)\r32-1\ruJ v wxG$& 8 ' & 3 OP& 8 '\r11 4\r4\r33-1 2k\r150\r215\r33-2 350\r33-3 1k\r34-K A\r35-1 1400\r35-2 15\r1 3 % & 1 4 %.\r35-3 la\r1 4 % & 1 4 %
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