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AC² = AD² + AC²
= 8² + 6²
= 64 + 36
= 100
AC = √100 = 10

BC² = AB² - AC²
= 26² - 10²
= 676 - 100
BC² = 576
BC = √576 = 24

L = L1 + L2
= (1/2 × 8 × 6) + (1/2 × 10 × 24)
= 24 + 120
= 144 ( c )
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