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= 13²
= 169 cm²
L sisi tegak = 1/2 × a × t
= 1/2 × 13 cm × 18 cm
= 13 cm × 9 cm
= 117 cm²
LP = La + Jumlah L sisi tegak
= La + 4(L sisi tegak)
= 169 + 4(117)
= 169 + 468
= 637 cm²