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2009-10-27T18:02:15+01:00
A)

P = ?

Obw = 16π cm
Obw = 2πr

16π = 2πr
2r = 16 /:2
r = 8

P = πr kwadrat
P = 64π cm kwadratowych

b)

P = ?

Obw = π m
Obw = 2πr

π = 2πr
2r = 1
r = 1/2

P = πr kwadrat
P = 1/4 π m kwadratowych

c)

Obw = ?

P = 16π cm²
P = πr kwadrat

16π = πr kwadrat
r kwadrat = 16
r = 4

Obw = 2πr
Obw = 8π cm

d)

Obw = ?

P = ⁴₉π m²
P = πr kwadrat

⁴₉π = πr kwadrat
⁴₉ = r kwadrat
r = 2/3

Obw = 4/3 π m

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