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= 2(100) + 2(75)
= 200 + 150
= 350
banyaknya patok = 350:5
= 70
27. L= (a+b) x t : 2
= (32+20) x 16 : 2
= 52 x 16 : 2
= 832 : 2
= 416
28. k= 6+4+2+5,5+2+7,5
= 27