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p = 4x
k = 84
mencari nilai p dan l =
k = 2 (p+l )
84 = 2(4x + 3x )
84 = 2(7x)
84/2=7x
42 = 7x
x = 6
jadi p = 4 x 6 = 24
l = 3 x6 = 18
mencari luas
L = p x l
= 24 x 18
= 432
84 = 2(p+l)
84:2= p+l
p+l = 42
panjang=4/(4+3)×42
= 4/7×42
=24cm
lebar =3/(4+3)×42
=3/7×42
=18cm
luas = p×l
=24cm×18cm
=432cm²