1.Oblicz pole i obw. koła o promieniu:
a) r=5cm
b) r=12dm
c) r=0,5cm
d) r=0,3m
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a) r-5cm P=πr² p=π5²=π25 P=25π cm , l=2πr l=2π5 l=10π cm
b)r-12dm P=π12² p=144π dm , l=2π12 l=24π dm
c)r-0,5 cm p=π0,5² p=0,25π cm ,l=2π0,5 l=π cm
d)r-0,3 m P=π0,3² p=0,09π , l=2π0,3 l=0,6π
Pole koła
P=πr²
r=5cm
P=π*5²=25*3,14=78,5cm²
r=12dm
P=π*12²=144*3,14=452,16dm²
r=0,5cm
P=π0,5²=0,5*3,14=1,57cm²
r=0,3m
P=π*03²=0,09*3,14=0,2826m²
L=2πr
L=2π*5=10π=10*3,14=31,4cm
L=2π*12=24π=24*3,1475,36dm
L=2π*0,5=π=3,14cm
L=2π*0,3=06π=06*3,14=1,884m
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a) r-5cm P=πr² p=π5²=π25 P=25π cm , l=2πr l=2π5 l=10π cm
b)r-12dm P=π12² p=144π dm , l=2π12 l=24π dm
c)r-0,5 cm p=π0,5² p=0,25π cm ,l=2π0,5 l=π cm
d)r-0,3 m P=π0,3² p=0,09π , l=2π0,3 l=0,6π
Pole koła
P=πr²
r=5cm
P=π*5²=25*3,14=78,5cm²
r=12dm
P=π*12²=144*3,14=452,16dm²
r=0,5cm
P=π0,5²=0,5*3,14=1,57cm²
r=0,3m
P=π*03²=0,09*3,14=0,2826m²
L=2πr
r=5cm
L=2π*5=10π=10*3,14=31,4cm
r=12dm
L=2π*12=24π=24*3,1475,36dm
r=0,5cm
L=2π*0,5=π=3,14cm
r=0,3m
L=2π*0,3=06π=06*3,14=1,884m