Hey guys,

Firstly, just to give context, I'm starting an OU degree in Autumn with Math as my first module. My math is questionable so I've been given a few practise papers to prepare myself and there are a few questions I just can't grasp, even with all the materials I've been given.

The Question:

Consider the following exam question and a student’s attempt at a solution.

''Anny wants to fence off an area in the middle of a field in order to

make an enclosure for some pigs. She has 200 metres of fencing

available. Should she make the fencing in the shape of a square or a

circle, in order to enclose the greatest area?''

Annie's solution:

200 = 2πr

= πr^2 = 3183.

200 = 4l

l^2 = 2500, so circle.

(a) Criticise the solution, explaining why it is difficult to follow.

(b) Write out a better solution.

Thanks

Jay

EDIT: Sorry if this is the wrong place to post! Like I said, my math is questionable so I'm even unsure about the topic title!