1. (6cm x 5cm)/2 = 30cm²/2 = 15cm²[br]2. (9cm x 7cm)/2 = 63cm²/2 = 31,5cm²[br]3. (6cm x 3cm)/2 = 18cm²/2 = 9cm²[br]4. (18cm x 15cm)/2 = 270cm²/2 = 135cm²[br]5. (20cm x 19cm)/2 = 380cm²/2 = 190cm²[br]6. (45cm x 45cm)/2 = 2025cm²/2 = 1.012,5cm²