Finding a missing radius of an annulus

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Other lessons in this sub-strand

1. Arcs and sectors
2. Segments and applications
3. Area of an annulus
4. Finding a missing radius of an annulus
5. Minor and major sectors
6. Perimeter of a sector
7. Finding the angle or radius of a sector
8. Area of an annular sector
9. The chord and the isosceles triangle
10. Minor and major segments in depth
11. Common region of two intersecting circles
12. Gardens, tracks, dartboards and paths