[填空题]
Cylindrical logs of length 2.7 m 1bj cvz ancpi-i2-0l2and radius 7.5cm ar2qw z,hl 39zaie used to build a wooden cabin. A wedge is cut from one log and the cross-section of this logq2ziaz 3,lwh9 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. 4.Find the volume of this log.