THE NEW STUDENT'S REFERENCE WORK 2213
RULES FOR FINDING THE VOLUME OF SOLIDS.
1. The volume of a regular prism is equal to the product of the area of its base by its altitude.
2. The volume of a cylinder is equal to the product of the area of its base by its altitude.
3. The volume of a pyramid is equal to one-third the product of the area of its base by its altitude.
4. The volume of a cone is equal to one-third the product of the area of its base by its altitude.
5. The volume of a sphere is equal to | the product of its radius
and its convex surface.
EXERCISE 45. (REVIEW.)
1. Complete these proportions:
7: =20 :* i:A= :i
2. If 18 horses eat 80 bu. of oats in 4 weeks, how many bushels will 16 horses eat in the same time!
3. Find the 3rd power of f.
4. Find the square root of 65.1249.
5. A ship was valued at $75,000, and was insured for f of its value at 3|%. Find the premium.
6. A man bought a farm of 80 A. of land for $3200, and sold it at a profit of $9.50 an acrei. What was the gain per cent?
7. Find the side of a square that contains as many square feet as
an oblong 210 ft. X 52^ ft.
•
8. Write the decimal for
\%A%, \%-
9. How many pecks of potatoes are there in 48 bu.y 3 pk. and 6 qt. f Find the cost of the same at 40c per peck.
10. How many bricks 8 in. X 4 in. will be required to lay a sidewalk 4 rd. long and 6 ft. wide!
EXERCISE 46.
Henry Brown has on his wood-lot a pile of wood 54 ft. long and 4 ft. high, which he sells to Joseph Taylor at $7.25 per cord,
1. Write how much money he should receive.
2. Write such a bill for the wood as Mr. Brown would make out. Receipt it yourself for Mr. Brown.
