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Verified answer
AC = √(AD² + CD²)= √(8² + 16²)
= √(64 + 256)
= √320
= 8√5 cm
AB = √(AD² + BD²)
= √(8² + 4²)
= √(64 + 16)
= √80
= 4√5 cm
BC = √(AC² + AB²)
20 = √((8√5)² + (4√5)²)
20 = √(320 + 80)
20 = √400
20 = 20 (terbukti sama)
jadi ∆ABC adalah segitiga siku-siku
semoga membantu ^^