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ED = BD - BE
Rumus Phytagoras :
BD² = BC² - CD² = 13² - 5² = 169 - 25 = 144
BD = √144 = 12
BE² = AB² - AE² = 10² - 8² = 100 - 64 = 36
BE = √36 = 6
Jadi ED = BD - BE = 12 - 6 = 6
Jawabannya : c. 6 cm