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= 1/2. 5. 12
= 30
L ABC = 1/2. AB. tC
= 1/2. 5. 4
= 10
L. arsir ACE = L ABE - L ABC
= 30-10
= 20
L ABD = 1/2. AB. tD
= 1/2.5. 8
= 20
L arsir BCD = L ABD - L ABC
= 20-10
= 10
L total = L arsir ACE + L arsir BCD
= 20 + 10
= 30 cm²