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= √100 - 36
= √64
= 8 cm
Lp = 1/4 x s²√3 + LΔ
= 1/2 x 6²√3 + 3 x 1/2 x 6 x 8
= 1/2 x 36√3 + 72
= 9√3 + 72
= 81√3 cm²