The Werner Arithmetic; Oral and Written. Book III--Parts I and II Volume 3

The Werner Arithmetic; Oral and Written. Book III--Parts I and II Volume 3

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1898 edition. Excerpt: ...to right angles. 3. But the sum of the central angles in Fig. 2 (z + b + c + d + e +/) is equal to right angles; f then the sum of all the other angles of the six triangles is equal to 12 right angles less 4 right angles or 8 right angles = 720. But the angular space that measures 720, as shown in Fig. 2, is made up of 12 equal angles; so each one of the angles is one 12th of 720 or 60. Two of these angles, as 1 and 2, make one of the angles of the hexagon; therefore each angle of the hexagon measures 2 times 60 or 120. 4. Using the protractor, construct a regular hexagon, making each side 2 inches long. Observe that since all the angular space about a point is equal to 4 right angles, or 360, and since the space around the central point of the hexagon is divided into 6 equal angles, each of these angles is an angle of (360-=-6), 60. But each of the other angles of these triangles has been shown to be an angle of 60; so each triangle is equiangular. Are the triangles equilateral? See page 59, 6 and 7. fSee page 29, Art. 66. 239. Miscellaneous Review. 1. A man buys goods for $60 and sells them for $75. He gains dollars. (a) The gain equals what part of the cost? What %? (b) The gain equals what part of the selling price? What per cent? (c) The cost equals what part of the selling price? What per cent? 2. When the cost is 2 thirds of the selling price what is the per cent of gain? 3. When the selling price is 2 thirds of the cost what is the per cent of loss? 4. Bought for $200 and sold for $300. What was the per cent of gain? 5. Bought for $300 and sold for $200. What was the per cent of loss? 6. A tax of 15 mills on a dollar was levied in a certain town, the assessed value of the taxable property being $475,250. If 5 % of the tax proves...show more

Product details

  • Paperback | 60 pages
  • 189 x 246 x 3mm | 127g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236745469
  • 9781236745460