1 prostokąt:
a,b=boki
p=ab
2 prostokąt:
a+10%a=a+0,1a=1,1a
b-10%b=b-0,1b=0,9b
p=1,1a×0,9b=0,99ab
ab=0,99ab+15m²
ab-0,99ab=15m²
0,01ab=15
ab=15:0,01=1500m²= pole pierwszej figury
0,99ab=0,99×1500=1485m²=pole drugiej figury
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1 prostokąt:
a,b=boki
p=ab
2 prostokąt:
a+10%a=a+0,1a=1,1a
b-10%b=b-0,1b=0,9b
p=1,1a×0,9b=0,99ab
ab=0,99ab+15m²
ab-0,99ab=15m²
0,01ab=15
ab=15:0,01=1500m²= pole pierwszej figury
0,99ab=0,99×1500=1485m²=pole drugiej figury