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= √36 + 16
= 7.21
Lp = s² + 4 x segitiga tegak
= 12² + 4 x ½ x a x t
= 144 + 4 x½ x 12 x 7.21
= 144 + 173.04
= 317.04 cm²
semoga benar ya. maaf kalau salah.