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a = 200cm
b = 270cm
Pp = 200cm * 270cm
Pp = 54 000cm²
Pr = e*f/2
e = 135cm
f = 180cm
Pr = 135cm * 180cm / 2
Pr = 24 300cm² / 2
Pr = 12 150cm²
12 150cm²/54 000cm² = 1215 / 5400 = 225/1000 = 45/200
= 9/40
Odp: C
P= 135 * 180 24300 cm kwadratowych
-----------= ---------- 12150
2 2
5400- 12150= 41850