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9/BD = BD/4
BD² = 36
BD = 6 CM
BC = √BD²+DC²
= √6²+4²
= √36+16
= 7,2 CM
2. EF = (AE X DC) + (AB X DE) / AE + DE
= (9 X 15) + (28 X 4) / 9+4
= 135 + 112 / 13
= 247 / 13
= 19 CM