1.
a)
Ob = π m
2π r = π /:π
2r = 1
r = 1/2
P = π * r² = π * (1/2)² = 1/4 π m²
b)
Ob = 2/3 π km
2π r = 2/3 π /:π
2r = 2/3
r = 1/3
P = π * r² = π * (1/3)² = 1/9 π km²
2.
P = 4/9 π m²
π r² = 4/9 π /:π
r² = 4/9
r = 2/3
Ob = 2π r = 2π * 2/3 = 4/3 π m
P = 2π dm²
π r² = 2 π /:π
r² = 2
r = √2
Ob = 2π r = 2π * √2= 2√2π dm
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1.
a)
Ob = π m
2π r = π /:π
2r = 1
r = 1/2
P = π * r² = π * (1/2)² = 1/4 π m²
b)
Ob = 2/3 π km
2π r = 2/3 π /:π
2r = 2/3
r = 1/3
P = π * r² = π * (1/3)² = 1/9 π km²
2.
a)
P = 4/9 π m²
π r² = 4/9 π /:π
r² = 4/9
r = 2/3
Ob = 2π r = 2π * 2/3 = 4/3 π m
b)
P = 2π dm²
π r² = 2 π /:π
r² = 2
r = √2
Ob = 2π r = 2π * √2= 2√2π dm