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Lp = 2La+Ka.t₁ + La + 4L(Segitiga) - 2La
Lp = La + Ka.t + 2a₁t₂
Lp = pl + 2(p+l)t + 2ps
Dengan s = √(a/2)²+t₂² = √6²+8² = 10
Maka,
Lp = 12.12 + 2(12+12)6 + 2.12.10
Lp = 144 + 2.24.6 + 240
Lp = 384 + 288
Lp = 672 cm² [B]