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= akar dr 4²+2²
= akar dr 16+4
= √20
= √4.5
= 2√5 cm
BE = akar dr DE²+BD²
= akar dr 5²+ (2√5)²
= akar dr 25+(4.5)
= akar dr 25+20
= √45
= √9.5
= 3√5 cm