1
Circle Revision
Use 2πr and πr² accurately with units
Chapter route
Areas Related to Circles
This chapter page turns the high-level subject view into an ordered learning slice, with direct links from curriculum items into topic and skill detail.
Ordered curriculum items
Each curriculum item can now route into topic and skill-level detail.
2
Arc Length
Calculate arc length from central angle and radius
3
Sector Area
Use central angle fraction of circle area
4
Sector Perimeter
Combine arc length with two radii
5
Segment Area
Identify segment as region between chord and arc
6
Segment Area
Subtract equilateral triangle area from sector area
7
Segment Area
Subtract right isosceles triangle area from sector area
8
Segment Area
Subtract triangle area from sector area for 120° central angle
9
Composite Figures
Break shaded regions into sectors, triangles and rectangles
10
Composite Figures
Combine straight lengths and arcs in composite boundaries
11
Applications
Apply sector and segment concepts to parks, tracks, designs and fields
12
Units and Approximation
Choose 22/7 or 3.14 and round answers sensibly
13
Error Analysis
Correct common region-identification mistakes
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