Arithmetic by George Augustus Walton

Author:George Augustus Walton
Language: eng
Format: epub, pdf
Publisher: American Book Co.
Published: 1909-03-25T05:00:00+00:00

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Oral and Written Exercise (See Map and Arts. 247-248.) 249. 1. The stock quotations in New York were telegraphed from that city to Chicago, San Francisco, Boston, Denver, and New Orleans at 10,30 a.m. standard time. Allowing no time for this transmission, give the time the telegram reached each city.

2. Allow 30 min. for transmission, and tell the time when a dispatch sent at 8 A.M. standard time in San Francisco reaches St. Louis, Philadelphia, Washington, Portland, Me.

3. At 2.15 P.M. St. Paul time, give the time at Baltimore, Quebec, Galveston, Los Angeles.

4. Find the difference in standard and solar time at Chicago; at San Francisco.

250l The shortest distance between points is a straight line.

Two or more lines that have the same direction are called parallel lines.

The outside of anything is called its surface.

A fiat surface is called a plane.

The representation of a plane surface bounded by lines is called a plane figure.

The sum of the bounding lines of a plane surface is called its

perimeter.

Written Exercise

251. 1. 1 mile equals how many rods ? how many yards ? how many feet ?

2. Change .25 mile to rods; 59.4 in. to rods.

3. At what rate per minute does a train go, if it runs 85 mi. per hour ?

4. Measure the length of each side of your schoolroom and find the perimeter of the floor surface.

5. Find the distance around the schoolhouse lot in rods and feet.

6. What is the cost of 18 yd. of rubber hose at 1&|^ a foot?

7. The two parallel sides of Mr. Vernon's house lot are 57 yd. 2 ft. apart. Give the width of the lot in feet.

8. What is the cost of netting for the two ends of a tennis court measuring 18 yd. each, at $.15 per running foot ?

9. How many steps of 2 ft. 6 in. does a person take in walking 31.2 miles ?

10. Mt. St. Elias is 3 mi. 2184 ft. high. Give its height in feet.

11. Mt. Blanc lacks 96 ft. of being 3 mi. high. Pike's Peak is 1633 ft. lower than Mt. Blanc. How high is Pike's Peak?

252. The difference in direction of two lines that meet, or tend to meet, is called an angle. The lines are called the sides and their meeting point the vertex of the angle.

To measure angles we use a protractor, which is a half circle whose circumference is marked off into 180% and each degree

into 60' (Art. 213). Any part

b ** of the circumference of the cir-Pbotractob cig ig Qjjied an arc. The arc cd on the protractor is 30% so the angle of the lines hd and Jc, whose vertex is at the center of the circle, is 30®. The arc ad is 50°, and so the angle of the lines ah and J(2, which is

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