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DR = √6^+8^24^
DR = √36+64+576 = √676 = 26 cm A
AC = √AB² + BC²
= √6² + 8²
= √100
= 10 cm
* Mencari diagonal EC
EC = √AC² + AE²
= √10² + 24²
= √676
= 26 cm
Jadi, panjang diagonal EC = 26 cm (Jawaban A)