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P=a*b
P= 200 * 270 = 54000 cm^
Obliczamy pole lustra:
P= (e*f)/2
P=(135*180)/2 = 12150 cm^
54000 - 100 %
12150 - x%
54000x= 1215000
x = 22,5 %
22,5 % = 225/1000 = 1/8
Pole lustra: 1/2 x 135 x 180 = 12150cm2
12150/54000 = 9/40
odpowiedź C