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Verified answer
Menentukan Luas Persegi PanjangRumus
Keliling Persegi Panjang = 2(P + L)
Luas Persegi Panjang = P x L
Soal
P = 4 + L
Keliling Persegi Panjang = 40 cm
Luas Persegi Panjang = ...
Penyelesaian
Tentukan Panjang dan Lebar Persegi Panjang
40 cm = 2(P + L)
40 cm = 2(4 + L + L)
40 cm = 8 + 4L
4L = 40 - 8
4L = 32
L = 32 / 4
L = 8 cm
P = 4 + L
P = 4 + 8
P = 12 cm
Maka Luas Persegi Panjang
= 12 cm x 8 cm
= 96 cm^2