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[" Q-4.In "/ABC" ,AB "=5cm,BC=8cm" ECA "...

[" Q-4.In "/_ABC" ,AB "=5cm,BC=8cm" ECA "=7cm" ."],[" If "D" and "E" are respectively the mid "],[" points of "AB" and "BC" ,deterinine the "],[" length of "DE" ? "]

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