Oblicz pole koła o obwodzie 4 dm.
Wzory: L=2r P=r²
Obliczałam ale coś mi nie wychodzi. XD
obwód koła = 2πr = 4 dm
r - promień = 4/2π = 2/π dm
pole kola = πr² = π(2/π)² = 4π/π² = 4/π dm²
L - 4dm
r = L/2
r = 4dm/2
r= 2dm/
P=r²
P=*(4dm/)²
P=*16dm²/²
P= 16 dm² / ²
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obwód koła = 2πr = 4 dm
r - promień = 4/2π = 2/π dm
pole kola = πr² = π(2/π)² = 4π/π² = 4/π dm²
L - 4dm
r = L/2
r = 4dm/2
r= 2dm/
P=r²
P=*(4dm/)²
P=*16dm²/²
P= 16 dm² / ²