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17) mAB=r*mLAOB

mAB=r*(180-y)

mADB=r*360-r(180-y)

=r*(180+y)

18) x=r*mLAOB

x=r*(180-y)

y=180-x/r

19)x=r*mLAOB

For number 17. I understood 360°-x.... Its just an expression I have to write.

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