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s = 8 cm
≡ Ditanya: Diagonal Persegi (d)?
≡ Dijawab:
⇔ Cara 1 [Menggunakan Pyhtagoras]:
⇒ d = √[s² + s²]
⇒ d = √[8² + 8²]
⇒ d = √128
⇒ d = √64 × √2
⇒ d = 8√2
⇔ Cara 2 [Fastest Way]:
⇒ d = s√2
⇒ d = 8√2 cm