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penyiku kedua)²
20² = (4x)² + x²
400 = 16x² + x²
400 = 17x²
x² = 400/17
x² ≈ 23,5294117647
x ≈ √23,5294117647
x ≈ 4,8507125007 cm
x ≈ 4,85 cm
dan 4x = 4×4,85 = 19,4 cm
sehingga kelilingnya = 20 + 19,4 + 4,85
= 44,25 cm.
Jawab
Keliling segitiga tersebut adalah 44,25 cm.
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