oblicz obwód koła o polu 144 " pi " cm 2 ? pomóżcie ! na jutro !
P = 144 π cm²
P = π * r² ------ wzór na pole koła
π * r² = 144 π / : π
r² = 144
r = √144
r = 12cm ---- promień koła
Ob = 2π * r
Ob = 2π * 12cm
Ob = 24π cm -------- odpowiedź
P = πr² => r = √P/π
r = √144π/π = √144 = 12 [cm]
Obw = 2πr
Obw = 2 x π x 12cm = 24π cm
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Pozdrawiam :)
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P = 144 π cm²
P = π * r² ------ wzór na pole koła
π * r² = 144 π / : π
r² = 144
r = √144
r = 12cm ---- promień koła
Ob = 2π * r
Ob = 2π * 12cm
Ob = 24π cm -------- odpowiedź
P = πr² => r = √P/π
r = √144π/π = √144 = 12 [cm]
Obw = 2πr
Obw = 2 x π x 12cm = 24π cm
----------------------------------------------------------------------------------------------------
Litterarum radices amarae sunt, fructus iucundiores
Pozdrawiam :)