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Hitunglah keliling dan luas persegi panjang yang memiliki ukuran : a. panjang = 15cm dan lebar = 8cm b. panjang = 2 kali lebar dan lebar = 5cm

Rani Maharani

Soal

Hitunglah keliling dan luas persegi panjang yang memiliki ukuran :

a. panjang = 15cm dan lebar = 8cm

b. panjang = 2 kali lebar dan lebar = 5cm

Pembahasan

a. Keliling = 2(panjang + lebar) = 2(15 cm + 8 cm) = 46 cm

Luas = panjang x lebar = 15 cm x 8 cm = 120 cm²

b. panjang = 2 x lebar

Keliling = 2(panjang + lebar) = 2(2ℓ + ℓ) = 6ℓ

6ℓ = 200 cm

ℓ = 33.33 cm (approx.)

panjang = 2ℓ = 66.67 cm (approx.)

Luas = panjang x lebar = 66.67 cm x 33.33 cm = 2222.22 cm²

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