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BC = 6
AB = 4
DE....AD
----- =-----
BC....AB
9...AD
-- =----
6....4
AD = 6 cm
3. AD = 3
DC = 6
EB = 5
EC = 4
AB..(CD+ AD)
----=--------------
DE......CD
AB..(6 + 3)
----=------
10....6
AB = ( 9 x 10 )/ 6
AB = 15