5.2/5.3 - Arc length/Area of arc and segment

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4 Terms

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what is the formula for arc length

l=rθ

2
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what is the formula for sector area

A=1/2×r²θ

3
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what is the formula for area of a segment

A=1/2×r²(θ-sin(θ))

4
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how would you derive this formula (using other formulae)

by doing the area of a sector - the area of a triangle (1/2×absinC)