a.

The polygon in question is an octagon and the farmer needs 9 additional stakes to completely fence his land.

b.

The polygon in question is a hexagon and the farmer needs 9 additional stakes to completely fence his land.

c.

The polygon in question is an octagon and the farmer needs 7 additional stakes to completely fence his land.

d.

The polygon in question is a pentagon and the farmer needs 10 additional stakes to completely fence his land.

e.

The polygon in question is a decagon and the farmer needs 8 additional stakes to completely fence his land.

Answer sheet:

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