4 (7 pts). Open the following graph: graph4.do The radius r…

4 (7 pts). Open the following graph: graph4.do The radius r = 25.6cm and central angle θ = 67°. (a) Find the arc length. (b) Find the area of the sector.   5 (4 pts). Open the following graph: graph5.doc The radius r = 16 and the arc length s = 6π. Find the central angle θ.   6 (4 pts). Open the following graph: graph6.docx The central angle θ = 11π/14 and the arc length s = 25π. Find the radius r.