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- A1a – Using and interpreting algebraic notation
- A2a – Substituting numerical values into formulae and expressions
- G9a – Circle parts – definitions and properties (an understanding of radius and diameter is helpful)
- G16a – Area of rectangles (an understanding of area is helpful)
- G17b – Circumference of a circle (this lesson introduces π)
Area of a circle
Visualise an approximate link between the area of a circle and its radius
Drag down the slider to see that the area of a circle with radius r is between 2r2 and 4r2.
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