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108+192=300
yng 192 itu trapesium yg bawah (a+b) * t /2
yang 108 itu sgtiga atasnya
= 48 × 4 cm²
= 192 cm²
L segitiga = 1/2 × (30-12) × (20-8) cm²
= 1/2 × 18 × 12 cm²
= 108 cm²
L seluruh = 192 cm² + 108 cm²
= 300 cm²