2. Oblicz pole Koła o obwodzie 40 cm
3. Oblicz obwód koła o polu 1/36 π cm2
2.
Ob=40 cm
Ob=2πr
40=2πr
r=20/π - promień
---
Pole
P=πr²
P=π(20²/π²)=400/π≈127,4cm²
=====================
3.
P=1/36π cm²
1/36π=πr²
1/36=r²
r=1/6
Ob=2π*1/6= 1/3π ≈ 1,04cm
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2.
Ob=40 cm
Ob=2πr
40=2πr
r=20/π - promień
---
Pole
P=πr²
P=π(20²/π²)=400/π≈127,4cm²
=====================
3.
P=1/36π cm²
P=πr²
1/36π=πr²
1/36=r²
r=1/6
---
Ob=2πr
Ob=2π*1/6= 1/3π ≈ 1,04cm