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l=2πr = 2 *π * 15=30π
l=2πr = 2 *π * 29=58π
l=2πr = 2 *π * 3,5=7π
l=2πr = 2 *π * 1,2=2,4π
2.
P=πr²=π * 8²=64π²
P=πr²=π * 12²=144π²
P=πr²=π * 25²=625π²
P=πr²=π * 2,5²=6,25π²
P=πr²=π * 170²=28900π²
a)Ob=2πr=2π15=30π cm
b)Ob=2πr=2π29=58π cm
c)Ob=2πr=2π3,5=7π cm
d)Ob=2πr=2π1,2=2,4π km
2.
a)P=πr²=π8²=64π cm²
b)P=πr²=π12²=144π cm²
c)P=πr²=π25²=625π cm²
d)P=πr²=π2,5²=6,25π cm²
e)P=πr²=π170²=28900π km²