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100 = sisi x sisi
10 = sisi
sisi = 3x + 1
10 = 3x + 1
9 = 3x
3 = x
K persei = 4 x sisi
= 4 x 10
= 40 cm
s=10
3x+1=10
3x=10-1
x=9/3
x=3
kliling = s*4
= 10 * 4 = 40