S Q4. [5 marks] I have 100 m of fencing and I want to fence off an area in the middle of a large field in the shape of a sector of a circle. [A sector is shaped like a piece of pizza or a piece of pumpkin л.] Find the ra- dius r and the central angle of the sector that maximizes the area. Draw a rough diagram of what the area looks like and mark the length of the "sides". r le r