Odpowiedź :
P=πr²
Ob=2πr
a)16π=2πr/:2π
r=8cm
P=πr²=π8²=64π
------------------------
π=2πr/:2π
r=1/2m
P=πr²=π(1/2)²=1/4πm²
----------------------------
0,12π=2πr/:2π
r=0,06mm
P=πr²=π(0,06)²0,036mm²
-----------------------------
4=2πr/:2π
r=4:2πdm
P=πr²=π(4:2π)²=16/4π²*π=4/πdm²
-----------------------------------------
2/3π=2πr/:2π
r=2/6=1/3km
P=πr²=π(1/3)²=1/9πkm²
b)
16π cm2=πr² /:π
16=r²
r=4cm
Obw=2πr
Obw=2π*4
Obw=8π cm
---------------------------
4/9πm2=πr² /:π
4/9=r²
r=2/3 m
Obw=2πr
Obw=2π*2/3
Obw=4/3πm
--------------------------
0,25πmm2=πr² /:π
0,25=r²
r=0,5mm
Obw=2πr
Obw=2π*0,5
Obw=π mm
----------------------------
2π dm2= πr² /:π
2=r²
r=√2dm
Obw=2πr
Obw=2π*√2
Obw=2√2πdm
---------------------------------------
3 km2=πr² /:π
3/π=r²
r=√3/π km
Obw=2πr
Obw=2π*√3/π
Obw=2√3π km
Ob=2πr
a)16π=2πr/:2π
r=8cm
P=πr²=π8²=64π
------------------------
π=2πr/:2π
r=1/2m
P=πr²=π(1/2)²=1/4πm²
----------------------------
0,12π=2πr/:2π
r=0,06mm
P=πr²=π(0,06)²0,036mm²
-----------------------------
4=2πr/:2π
r=4:2πdm
P=πr²=π(4:2π)²=16/4π²*π=4/πdm²
-----------------------------------------
2/3π=2πr/:2π
r=2/6=1/3km
P=πr²=π(1/3)²=1/9πkm²
b)
16π cm2=πr² /:π
16=r²
r=4cm
Obw=2πr
Obw=2π*4
Obw=8π cm
---------------------------
4/9πm2=πr² /:π
4/9=r²
r=2/3 m
Obw=2πr
Obw=2π*2/3
Obw=4/3πm
--------------------------
0,25πmm2=πr² /:π
0,25=r²
r=0,5mm
Obw=2πr
Obw=2π*0,5
Obw=π mm
----------------------------
2π dm2= πr² /:π
2=r²
r=√2dm
Obw=2πr
Obw=2π*√2
Obw=2√2πdm
---------------------------------------
3 km2=πr² /:π
3/π=r²
r=√3/π km
Obw=2πr
Obw=2π*√3/π
Obw=2√3π km
a)
2πr = 16π
r=8 cm
P =π r² =64π cm²
2πr = π
r=1/2 m
P=1/4π m²
2πr = 0,12π
r=0,06 mm
P=0,0036π mm²
2πr = 2/3*π
r=1/3 km
P= 1/9π km²
2πr = 4
r=2/π dm
P= 4/π fm²
b)
πr²=16π cm²
r=4
Obw = 8π cm
πr²=4/9π m²
r=2/3
Obw = 4π/3 m
πr²=0,25π mm²
r=0,5
Obw = π mm
πr²=2 π dm ²
r=√2
Obw = 2√2 π dm
πr²= 3 km ²
r=√3
Obw = 2√3 π km
Pozdrawiam! :)
2πr = 16π
r=8 cm
P =π r² =64π cm²
2πr = π
r=1/2 m
P=1/4π m²
2πr = 0,12π
r=0,06 mm
P=0,0036π mm²
2πr = 2/3*π
r=1/3 km
P= 1/9π km²
2πr = 4
r=2/π dm
P= 4/π fm²
b)
πr²=16π cm²
r=4
Obw = 8π cm
πr²=4/9π m²
r=2/3
Obw = 4π/3 m
πr²=0,25π mm²
r=0,5
Obw = π mm
πr²=2 π dm ²
r=√2
Obw = 2√2 π dm
πr²= 3 km ²
r=√3
Obw = 2√3 π km
Pozdrawiam! :)