What are the names and measures of the minor arc and the major arc?

What are the names and measures of at least three minor arcs, at least one major arc and at least one semicircle?

Your friend claims that any two arcs with the same measure are similar. Your cousin claims that any two arcs with the same measure are congruent. Who is correct? Explain.

[size=85]The pie chart above was found here: https://public.chartblocks.com/c/54a6cbc4c9a61d6e1060f70f[/size][br][size=100]Based on this survey what percentage of people like Hip Hop music? Was Rap or Rock more popular with the people asked? How much more popular?[/size]

On a regulation dartboard, the outermost scoring circle is divided into twenty congruent sections. What is the measure m of each arc in this circle in terms of degrees? The diameter of the board is 451mm and there is a border that isn't worth any points of 55.5mm around the edge. Find the arc length of one section of the board.