please help me to answer this.the sheep pen.it my project add math.it important to me.please.?

Question

a farmer wishes to build a rectangular sheep with a 160 m fence,using one side of an existing shed as the side.the shed is also rectangular of measurement 20 m mutiple 20 m.

[a]find the measurement and the area of the sheep pen if one side of the existing shed is used as the width of the sheep pen.

[b]by using the fence of the same length and using the width of the shed as the part of the sheep pen,find the length and width of the sheep pen with maximum area.

Answer 1

Using the side of the building with 160m of fencing you could inclose an area 70m x 20m 1400 sq m