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tΔ = √576 + 49
tΔ = √625
tΔ = 25 cm
L = La + 4 LΔ
L = 14 . 14 + 4 . 14 . 25 : 2
L = 196 + 700
L = 896 cm²
= 196 + 700
= 869 cm²