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L=2 pi r
30 pi = 2 pi r
30 = 2r
15= r
P= pi r kwadrat
P = 15 kwadrat pi
P = 225 pi cm kwadratowych
b)
2/3 pi = 2 pi r
2/3 = 2r
1/3 = r
P= 1/3 pi kwadrat
P= 1/9 pi cm kwadratowych
c)
0,08 pi = 2 pi r
0,08 = 2r
0,04 = r
P= 0,04 kwadrat pi
P=0,0016pi cm kwadratowych
O=2πr
a)
30π=2πr
r=30π/2π
r=15 cm
P=π*15²
P=225π cm²
b)
2/3π=2πr
r=2/3π/2π
r=2/3π*1/2π
r=1/3 cm
P=π*1/3²
P=1/9π cm²
c)
0,08π=2πr
r=0,08π/2π
r=0,04 cm
P=π*0,04²
P=0,0016π cm²