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15cm - 4cm = 11cm
P= 15cm * 10cm - 1/2 * 4cm * 8,5cm - 1/2 * 1,5cm * 15cm
P= 150cm² - 55cm² - 17cm² - 11,25cm² = 66,75cm²
d)
15cm- 4,5cm-2,5cm=8cm
10cm-5cm=5cm
P=15cm*10cm -1/2*5cm*4,5cm -1/2*2,5cm*10cm
P=150cm² -6,25cm² -12,5cm²
P=131,25cm²