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p = 6 + l = 6 + 12 = 18
K = 2 ( p + l )
60 = 2 ( 6 + l + l)
60 = 2 ( 6 + 2l )
60 = 12 + 4l
48 = 4l
12 = l
L = p × l = 18 × 12 = 216 cm²
60 = 2 ( 30 + (30 - 6) )
60 = 2 ( 30 + 24 )
Jadi panjang nya adalah 30 cm dan lebarnya 24 cm
L = P × L
L = 30 × 24
L = 180 cm^2