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=((25-18)×14)÷2×2
=(7×14)÷2×2
=98÷2×2
=49×2
=98cm
L.balok=p×l
=18×(14-12)
=18×2
=36cm
L.bangun gabungan=L.2buah segitiga+L.balok
=98cm+36cm
=134cm
Semoga membantu :)
Kalau salah mohon dimaafkan :)