[填空题]
Cylindrical logs of lenct5 7 db334g86c dav1wfcncyigtdi 7xv,a dmwwi: wh 8+r5jc0+ah 2.7 m and radius 7.5cm are used to build a wooden cabin. A wedge is cut from one lo aih:7a+8vmd+ di ,jwxcw 5w0rg and the cross-section of this log is illustrated in the following diagram.
1.Convert 108 degrees into radians, leaving your answer in exact values.
2.Find the length of the missing arc ABC. cm
3.Find the area of the missing sector ABCO. $cm^2$
4.Find the volume of this log. $cm^3$