Learning objectives
Convert between degrees and radians using π radians = 180°, and work with exact radian angles such as π/6, π/4, π/3 and 2π/3
Calculate arc length s = rθ, sector area A = ½r²θ and the perimeter of a sector, with θ measured in radians
Find the area of a segment as ½r²(θ − sin θ) and the length of a chord as 2r sin(θ/2)
Solve composite problems built from sectors, segments and triangles, using right-angled trigonometry, the cosine rule and ½ab sin C to find missing lengths, angles and areas
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