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= 2.LΔ + L persegi panjang + LΔkecil
= 2(a.t/2) + p.l + a.t/2
= a.t + p.l + a.t/2
= 10.10 + 3.10 + 3.3/2
= 100 + 30 + 9/2
= 130 + 4,5
L total = 134,5 m