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

[jxballistic]

Hi 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)

 

[Menomaths]

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

 

[jxballistic]

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

Thanks I knew that but do you know how to do b I) and ii)?

 

[dalonga]

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