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h=12cm - 5= 7cm
P=½ (a+b) x h
p=½ x 12 x 7
p= 42 cm²
a+b = 1,2m = 12cm
h = 12cm - 5cm = 7cm
P = 1/2 x (a+b) x h
P = 1/2 x 12cm x 7cm = 6cm x 7cm = 42cm²
p=1/2 razy h razy(a+b)=1/2razy 7=3,5razy12=42cm kradratowe