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Panjangnya = x
Lebarnya = y
x = 4 + y
2x + 2y = 72
2( 4 + y ) + 2y = 72
8 + 2y + 2y = 72
4y = 64
y = 16
x = 4 + y
x = 4 + 16
x = 20
Panjangnya adalah 20 cm
Lebarnya adalah 16 cm
Rumus luas persegi panjang :
P . L
20 . 16 = 320 cm² ( C )