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144 = 2 ( 3x+10 + x +10 )
144 : 2 = 3x+x+10+10
72 = 4x+20
4x = 72-20
4x = 52
x = 52÷4 = 13
p = (3x+10) = (3×13+10) = 39+10 = 49 cm
l = (x+10) = 13+10= 23 cm
144 = (3x+10)+(x+10)+(3x+10)+(x+10) = 8x+40= 144
8x=144-40
x = 104 : 8
=13
panjang (3x+10)
3.13+10 = 49
lebar (x+10)
13+10 = 23
semoga membantu,,,