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prbandingan p dan l = 5:4
k prbandingan = p x l
5x4 = 20 cm
jadi pnjangnya 20 lebarnya 4
Kll = 2(5x + 4x)
80 = 2(9x)
80 = 18x
80/18 = x
4,4 = x
--> jadi, panjang = 5x ⇒ 5(4,4) ⇒ 22 cm dan lebar = 4x ⇒ 4(4,4) ⇒ 17,6 cm
2. L = 1/2(d₁ x d₂)
600 = 1/2(4x x 3x)
600 = 1/2(12x²)
600 = 6x²
600/6 = x²
100 = x²
10xm = x
--> jadi, panjang d₁ = 4x ⇒ 4(10) ⇒ 40cm dan d₂ = 3x ⇒ 3(10) ⇒ 30cm
nomer 3 nyusul yaa