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lebar = Luas ÷ panjang
lebar= 210÷30 = 7 cm.
kell = 2 x (p+l)
kell =2 x ( 30+7)
kell = 2 x 37
kell = 74 cm2.
210 = 30 x Lebar
Lebar = Luas : Panjang
= 210 : 30
= 7 cm
Maka, Panjang = 30 cm dan Lebar = 7 cm
Keliling = 2 x ( p + l )
= 2 x ( 30 + 7 )
= 2 x 37
= 74 cm
Jadi, keliling dari persegi panjang adalah 74 cm.