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l = 2x - 3
a. K = 2 (3x + 2 + 2x - 3)
K = 2 (5x - 1)
K = 10x - 2
b. jika K= 36 cm
36 = 10x - 2
38 = 10x
3,8 = x
maka p = 3x + 2 = 11,4 + 2 = 13,4 cm
l = 2x - 3 = 7,6 - 3 = 4,6 cm
b. 210 maybe