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LΔ = a . t : 2
tΔ = √8² + 6²
tΔ = √64 + 36
tΔ = √100
tΔ = 10 cm
L = 12 . 12 + 4 . 12 . 10 : 2
L = 144 + 240
L = 384 cm²
= 4 x
= 240 cm²