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P=5+l
k=2(p+l)
90=2(5+l+l)
90=10+4l
80=4l
20=l
p = ( x + 5 cm )
ditanya = lebar ? dan panjang
jawab = Kell = 2p + 2l
90 = 2( x + 5 ) + 2x
90 = ( 4x + 10 )
4x = 90 - 10
. 4x = 80
x .= 80/4
.x = 20 cm → lebar