31. (a) Using the fact that the area
A
of a rectangle is (width)
× (
length), we find
(
)
(
)(
)
(
)
(
)(
)
total
2
2
3.00acre
25.0perch
4.00perch
40 perch
4 perch
3.00 acre
100perch
1acre
580 perch .
A
=
+
§
·
=
+
¨
¸
©
¹
=
We multiply this by the perch
2
→
rood conversion factor (1 rood/40 perch
2
) to obtain the
answer:
A
total
= 14.5 roods.
(b) We convert our intermediate result in part (a):
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 Spring '08
 shylnov
 Physics, International System of Units, 1m, perch, 1 rood, 1acre

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