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AB = BC
Perbandingan sisi = AD : AB = 3 : 1 atau DC : BC = 3 :1
K = 42 cm
42 cm = 2 ( 3x + 1x )
42 cm = 6x + 2x
42 cm = 8x
5,25 cm = x
AD = DC ⇒ 5,25 × 3 = 15,75 cm
AB = BC ⇒ 5,25 × 1 = 5,25 cm
42 = 3.1/2x
84 : 7 = 12 maka panjang sisinya adalah 12 dan 9