. Complete arithmetic . ; and so on. 170. Area. The number of square units in a surface is called its area. For example, if this figure represents a surface 4 yd. long and 2yd. wide, the area is 2 x 4 x 1 square yard,or 8 square yards. 171. Square Measure. The coj&m(^table of square measure is as foj^^ows : 144 square inches () = 1 squareVoot (sq. ft.)0 square feet = 1 square yard (sq. yd.)3O5 square yards = 1 square rod (sq. rd.)160 square rods = 1 acre (A.)^7-ts 640 acres = 1 square nuw (sq. mi.) \ EXERCISE 87Reduce to the next lower units: 1. 13 sq. ft. 4. 43 sq. yd. 7. 6 A. 10. 5 sq.
. Complete arithmetic . ; and so on. 170. Area. The number of square units in a surface is called its area. For example, if this figure represents a surface 4 yd. long and 2yd. wide, the area is 2 x 4 x 1 square yard,or 8 square yards. 171. Square Measure. The coj&m(^table of square measure is as foj^^ows : 144 square inches () = 1 squareVoot (sq. ft.)0 square feet = 1 square yard (sq. yd.)3O5 square yards = 1 square rod (sq. rd.)160 square rods = 1 acre (A.)^7-ts 640 acres = 1 square nuw (sq. mi.) \ EXERCISE 87Reduce to the next lower units: 1. 13 sq. ft. 4. 43 sq. yd. 7. 6 A. 10. 5 sq. mi. 2. 2S sq. ft. 5. 62 sq. yd. 8. 15 A. 11. 25 sq. mi. 3. 60 sq. ft. 6. 124 sq. rd. 9. 35 A. 12. 150 sq. mi. 13. Reduce 75 sq. ft. 36 sq. in. to square inches. 14. Reduce 2 sq. yd. 58 sq. in. to square inches. 15. Reduce 52 sq. yd. 8 sq. ft. to square feet. 16. Reduce 67,592 sq. in. to higher units. 17. Reduce 47,916 sq. ft. to higher units. 18. Reduce 22,471 sq. yd. to higher units. SQUARE AND CUBIC MEASURES 169. 172. A Cube. A solid bounded by six equal squares iscalled a cube. If each edge is 1 in., the cube is 1 cubic inch; if eachedge is 1 ft., the cube is 1 cubic foot; and so on. 173. Volume. The number of cubic units a body contains is called its volume. For example, if this figure represents a solid5 ft. long, 3 ft. wide, and 7 ft. high, each columnof cubes as here shown contains 7x1 cubic 3x5 such columns may be placed on the bot-tom of the solid, so the volume is 3x5x7x1cubic foot, or 105 cilbic feet. 174. Cubic Measure. The common tableof cubic measure is as follows: rrt 1 i-+--f I 1728 cubic inches () — 1 cubic foot ()27 cubic feet = 1 cubic yard (cu. yd.)128 cubic feet = 1 cord (cd.) A cubic yard of earth is considered a load. EXERCISE 88 Reduce to the next lower units: 1. 2 cu. ft. 4. 125 cu. ft. 7. 25 cu. yd. 10. 25 cd. 2. 25 cu. ft. 5. 33J cu. ft. 8. 36 cu. yd. 11. 125 cd. 3. 75 cu. ft. 6. 66-1 cu. ft. 9. 125 cu. yd. 12. 500 cd. Reduce t
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