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P=4×a×b×½
P=4×9×12×½
P=216cm²
9 i 12 - 1/2 przekątnych
9*2 = 18 - 1 przekątna
12*2 = 24 - 2 przekątna
pole d * d /2
18*24/2 = 216 [cm2]
* 2x 9 cm = 18cm
8 2x 12cm= 24 cm
Pole= e x f ; 2
18 x 24 ; 2
18 x 12
P= 180 + 36 = 216