Posted by Temperance on .
What is the radius if:
degree of measurement of arc=30
length=1/3xy(pi)
My answer was 8xy.
degree of measurement of arc=40
length=8/9(t)(pi)
My answer was 9t.
degree of measurement of arc=18
length=6(y)pi
My answer was 45y.
These are the questions I missed, along with my answers. I would be grateful if someone could explain what I did wrong and work out the problem, so that I may understand it fully. Cheers!

Geometry 
Reiny,
These questions use the same formula
arc = rØ as we saw in the third part of your previous post.
I will do the first one:
r = ?
Ø = 40(π/180) = 2π/9 radians
arc = (8/9)tπ
r(2π/9) = (8/9)tπ
r = 4t
do the others the same way