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AC = √(AF²+CF²)
= √8²+6²
= √64+36
= √100
= 10
BC = AC = 10
AB = 2.CF
= 2. 6
= 12
2.DF = DF+8
DF = 8
D1 = AD = 16
D2 = CE = 12
L ABCDE = L ACDE + L ABC
= 1/2. D1.D2 + 1/2. AB. AF
= 1/2 (D1.D2 + AB.AF)
= 1/2 (16.12 + 12 . 8)
= 1/2. 12 (16+8)
= 6. 24
= 144 cm²