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~ Keliling = 54 m
~ p - l = 5 , p = l + 5
dit :
Luas?
jawab :
Terlebih dahulu cari lebar menggunakan rumus keliling persegi panjang.
K.Persegi Panjang = 2 × (p + l)
54 = 2 × (l + 5 + l)
54 = 2 × (2l + 5)
54 = 4l + 10
54 - 10 = 4l
44 = 4l
l = 44/4
l = 11
Lebar = 11 m
Panjang - Lebar = 5 m
Panjang - 11 m = 5 m
Panjang = 5 m + 11 m
Panjang = 16 m
Luas Persegi Panjang = p × l
Luas Persegi Panjang = 16 m × 11 m
Luas Persegi Panjang = 176 m²
∴ Jadi Luasnya sebesar 176 m²