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Verified answer
A.AE = AC : 2
= 36 : 2
= 18 cm
DE = BD : 2
= 48 : 2
= 24 cm
b.
BC^2 = AE^2 + DE^2
BC^2 = 18^2 + 24^2
BC^2 = 324 + 576
BC^2 = 900
BC = 30 cm