Odpowiedzi

2010-03-19T20:22:34+01:00
D1 = 6 cm ---> r1 = 6cm :2 = 3 cm
r2 = r1 + 2 cm = 3 cm + 2 cm = 5 cm
P1 = π*(r1)² = π *(3 cm)² = 9 π cm²
P2 = π*(r2)² = π* (5 cm)² = 25 π cm²
P2 - P1 = 25 π cm² - 9 π cm² = 16 π cm²
Odp. Pole koła wzrosło o 16 π cm².
1 5 1