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Verified answer
Misalpanjang = x = 3y + 1
lebar = y
K = 2 × ( p + l )
26 = 2 × ( x + y )
26 = 2 × ( 3y + 1 + y )
26 = 2 × ( 4y + 1 )
26 ÷ 2 = 4y + 1
13 = 4y + 1
13 - 1 = 4y
12 = 4y
y = 3
x = 3y + 1 = 3(3) + 1 = 10