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| == Kreis == | | == Kreis == |
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| == Kreisring == | | == Kreisring == |
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| == Kreisausschnitt == | | == Kreisausschnitt == |
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| == Kreisabschnitt == | | == Kreisabschnitt == |
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| == Ellipse == | | == Ellipse == |
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| [[Kategorie:Formel Geometrie]] | | [[Kategorie:Formel Geometrie]] |
| [[Kategorie:Ad man]] | | [[Kategorie:Ad man]] |
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Kreis
Näherungswert/Faustformel für den Kreisumfang
A Fläche
d Durchmesser
r Radius
U Umfang
π Kreiszahl Pi (≈ 3,14159)
Kreisring
A Kreisringfläche
D Außendurchmesser
d Innendurchmesser
dm mittlerer Durchmesser
R Radius Kreisring außen
r Radius Kreisring innen
b breite des Kreisrings
L gestreckte Länge
π Kreiszahl Pi (≈ 3,14159)
Kreisausschnitt
A = (π · d² · α) / (4 · 360°)
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A Fläche des Kreisausschnitts
d Durchmesser
r Radius
lB Bogenlänge
α Innenwinkel
π Kreiszahl Pi (≈ 3,14159)
Kreisabschnitt
A = (lB · r - l (r - b)) / 2
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A = (π · d² ) / 4 · (α / 360) - (l(r - b)/2)
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A = (l · r - r² · sin (l/r)) / 2
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A Fläche
r Radius
d Durchmesser
lB Bogenlänge
l Sehnenlänge
b Breite
α Innenwinkel
Ellipse
A Fläche
d kleine Achse
D große Achse
r kleine Halbachse
R große Halbachse
U Umfang
Pfad: Home / Mathematik / Geometrie / Kreis