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©G Dear2009 – Not to be sold/Free to use
Area of CirclesArea of Circlesand Elipsesand ElipsesStage 6 - Year 12Stage 6 - Year 12
General Mathematic(HSC)
2
Area of Circle
Radius
Area = r2
5 cm= x 52
= 25 cm2 (Exact)
≈ 78.54 cm2(Approx)2 decimal place
End ofEnd ofSlideSlide
3
60o 5 cm
Area of Sector
r
Area = x r2
≈ 13.1 cm2(Approx)1 decimal place
360
Area = x x 5260
360
Fraction of the circle.
Area of the circle.
End ofEnd ofSlideSlide
4
Area of an Annulus
Area = R2
= x 52
= 21 cm2 (Exact)
≈ 65.97 cm2(Approx)2 decimal place
Rr- r2
5cm2cm
- x 22
Annulus Grass Garden
Area of Large circle.
Area of small circle.
End ofEnd ofSlideSlide
5
3cm
4cm
Area of an Ellipse
Area = ab
= x 3= 12 cm2 (Exact)
≈ 37.7 cm2(Approx)1 decimal place
x 4a
b
Drawing an EllipseEnd ofEnd ofShowShow
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