Hard Geo and sqsrs question from james ruse 2006 trial (1 Viewer)

jxballistic

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jr2006.JPGHi guys,
for some reason the solutions were missing two pages so I wasnt sure of the answer in question a) ii) and I actually dont know how to do b i) ii) .
Can someone please show me how to do b i) ii)
 
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Menomaths

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The first one,
(1.005^179)*400=976.75
 

dalonga

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I) let angle AOB=α and angle DOC=β,
Arc length=rα+rβ
=r(α+β)
but angle ADE=α/2 also angle DAC=β/2
but angle DEC=angleCAD+angleADE
θ=α/2+β/2
2θ=α+β
Arc length AB+CD=r×2θ
=2rθ
 

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