LAND MEASUEE 



41 



4. Select a triangular field near the schoolhouse, measure 

 it, and estimate the number of acres it contains. 



5. A farmer has 2 rectangular pieces of land to fence; 

 one is 40 rd. by 40 rd., the other 80 rd. by 20 rd. How 

 much will it cost to fence each at 55$ per rod ? How many 

 acres in each field ? 



6. Select an irregular 

 4-sided field near the 

 schoolhouse, and estimate 

 the number of acres it 

 contains. 



NOTE. To measure the acres 

 in an irregular, 4-sided field, 

 measure the diagonal (the dis- 

 tance from one corner to the 

 opposite corner), and solve each 

 triangle. Their sum will be the 

 area of the field. 



FOUR-SIDED FIELD 



46. Barbed wire is sold 

 by the roll. The average- 

 sized roll weighs 100 Ib. One pound of barbed wire averages 

 12 ft. in length. A pound of staples contains about 100. 



EXERCISE 



1. How many rolls of wire and pounds of staples must 

 be bought for 80 rd. of fence 3 wires high, the posts being 

 12 ft. apart ? 



2. With wire at $1.75 per cwt., and staples at 40 per 

 pound, estimate the cost of the wire and staples required to 

 build f mi. of fence 4 wires high. 



3. A fence 80 rd. long is built out of posts set 12 ft. 

 apart with woven wire 27 in. high, and 3 strings of barbed 



