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P=49π
b) r=12/2
r=6
P=πr²
P=36π
c) Odległość okręgu od środka jest równa promieniowi r.
r=17/2
r=8,5
d) 10=πr²
10/π=r²
r=√(10/π)
e) 5=2πr
r=5/(2π)
f) 4=πr²
r=2/√π
l=2πr
l=4π/√π
P = πr²
p = 7²π
p = 49π
b)
l = 2r
r = 6
p = πr²
p = 36π
c)
r = 8,5
ob = 2πr
ob = 17π
d)
p = πr²
10 = πr²
r² = 10/π
r = √10/π
e)
ob = 2πr
5 = 2πr
r = 5/2π
f)
p = πr²
4 = πr²
r² = 4/π
r = 2/√π
ob = 2πr
ob = 4/√π