Odpowiedzi

2010-01-10T19:34:45+01:00
P= π r²
r=10
P = 100π
a)r = 10 + (10% × 10)
r = 11
p = 121π

100% - [(100π ÷ 120π) × 100%] = 100% - 83% = 17%
Pole wzrośnie o 17%

b) r=20
P=400π
100% - [( 100π ÷ 400π) × 100%] = 100% - 25% = 75%
Pole wzrośnie o 75%