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a) 6*4 / 2 = 24/2= 12cm²
6*4/2 = -//-
14*10 /2 = 7*10 = 70
12 + 12+ 70 = 94 cm²
200cm² - 94 cm² = 104cm²
b)12*3/2 = 36/2= 18cm²
20*7/2=10*7=70cm²
70 + 18= 88cm²
200-88=112cm²
c)4*20/2 = 4*10=40cm²
7,5*6/2=7,5*3=22,5cm²
12,5 * 10 /2 = 125/2=62,5cm²
40 +22,5+62,5=40+85=125cm²
200-125=75cm²
d)6*4/2=12cm²
6*6/2=6*3=18cm²
4,5*6/2=4,5*3=13,5cm²
4,5*4/2=4,5*2=9cm²
12+18+13,5+9=52,5
200-52,5=147,5
Liczę na naj.