"Wentworth & Hill's Exercise Manual: Arithmetic, Τόμος 1


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Σελίδα 75 - SQUARE MEASURE 144 square inches (sq. in.) = 1 square foot (sq. ft.) 9 square feet — 1 square yard (sq. yd.) 30^ square yards = 1 square rod (sq. rd.) 160 square rods = 1 acre (A.) 640 acres = 1 square mile (sq.
Σελίδα 232 - A circle is a plane figure bounded by a curved line, called the circumference, every point of which is equally distant from a point within called the center.
Σελίδα 250 - A SPHERE is a solid, or volume, bounded by a curved surface, all points of which are equally distant from a point within, called the centre.
Σελίδα 78 - The circumference of a circle is divided into 360 equal parts, called degrees; each degree into 60 minutes ; each minute into 60 seconds.
Σελίδα 151 - Sixty days after sight of this first of Exchange (Second and Third of the same tenor and date unpaid...
Σελίδα 76 - CUBIC MEASURE 1728 cubic inches (cu. in.) =1 cubic foot (cu. ft.) 27 cubic feet = 1 cubic yard (cu. yd.) 128 cubic feet = 1 cord (cd...
Σελίδα 75 - LENGTH 12 inches (in.) = 1 foot (ft.) 3 feet = 1 yard (yd.) 5| yards = 1 rod (rd.) 320 rods = 1 mile (mi.) 1 mile = 1,760 yd. = 5,280 ft. MEASURES OF SURFACE 144 square inches (sq. in.) = 1 square foot (sq. ft.) 9 square feet = 1 square yard (sq.
Σελίδα 232 - The circumferences of two circles have the same ratio to each other as their radii, or as their diameters. Thus, if the radius of a circle be doubled, the circumference will also be doubled ; or, if the diameter be trebled, the circumference will also be trebled ; and so on. It follows that the ratio of the circumference of a circle to its diameter is the same for all circles.
Σελίδα 244 - How many cubic yards of earth must be dug out in making a tunnel 100 yds. long, whose section is a semicircle with a radius of 10 ft. ? 417. The bill for digging a well 45 ft. deep, and 3 ft. 9 in. in diameter was $82.50. Find the charge per cubic yard. 418. If a cubic foot of brass is drawn into a wire ^ of an inch in diameter, what will be the length of the wire ? 419. What will it cost to sink a well 50 ft. deep and 3f ft. in diameter, at $3.48 per cubic yard?
Σελίδα 212 - Plane is a surface upon which straight lines can be drawn ia all directions. The surface of still water is a good example of a plane surface. A Plane Figure is a portion of a plane surface bounded by lines. The Area of a plane figure is the ratio of its magnitude to that of another plane figure assumed as the unit. For the units of area, see page 79. The unit most commonly used is the square foot. A Quadrilateral is a plane figure bounded by four straight lines. For example, A BCD is a quadrilateral...

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