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392 = 2 ( 3x + 4 + x + 6 )
392/2 = 4x + 10
196 = 4x + 10
4x = 196 - 10
4x = 186
x = 186/4
x = 46,5 cm
maka,
p = 3x + 4
= 3(46,5) + 4
= 139,5 + 4
= 143,5 cm
l = x + 6
= 46,5 + 6
= 52,5 cm
2(4x+10)=392
8x+20=392
8x=392-20
8x=372
x=372/8
=46.5
panjang= 3(46.5)+4=143.5
lebar = 46.5 + 6 =52.5