 | James S. Russell - Arithmetic - 1847 - 340 pages
...or less than right angles. 14. A Triangle is a plane surface enclosed by three straight lines. 15. The base of a triangle is the side on which it is supposed to stand. MENSURATION. 17. The Hypothertuse is the side in a triangle opposite a right angle.... | |
 | Horatio Nelson Robinson - Arithmetic - 1859 - 348 pages
...how many acres in the field ? Ans. 11 A. 5 sq. ch. CASE IV. 459. To find the area of a triangle. 460. The Base of a triangle is the side on which it is supposed to stand. 461. The Altitude of a triangle is the perpendicular distance from the angle opposite... | |
 | Horatio Nelson Robinson - Arithmetic - 1860 - 444 pages
...having one right angle, as at C. 673. The Hypotenuse is the side opposite the right angle, as AB 673. The Base of a triangle is the side on which it is supposed to stand, as A C. 674. The Altitude of a triangle is the perpendicular distance froui the... | |
 | William James Milne - Arithmetic - 1877 - 418 pages
...right angle. 526. The Hypotenuse of a right-angled triangle is the side opposite the right angle. 527. The Base of a triangle is the side on which it is assumed to stand. 528. The Perpendicular is the side which forms a right-angle with the base. The relation of the squares... | |
 | Frederic William Bardwell - Arithmetic - 1878 - 416 pages
...right-angled triangle is opposite the right angle, and is called the hypothenuse, as in BC in the figure. The base of a triangle is the side on which it is assumed to rest, but any side may be taken for the base. In the figure, CA would be regarded as the base and AB... | |
 | Joseph Ficklin - Arithmetic - 1881 - 412 pages
...sides, a Pentagon; of six sides, a Hexagon ; etc. 6O9. A Triangle is a polygon of three sides ; as ABC. The Base of a triangle is the side on which it is supposed to stand, AB. The Vertical Angle is the angle opposite the base, asC. The Altitude is the... | |
 | Arithmetic - 1882 - 526 pages
...obtuse angle. (See Fig. 7.) c. An acute-angled triangle has three acute angles. (See Fig. 8.) F¡ ^ d. The base of a triangle is the side on which „ it is supposed to stand. e. The vertex is the point opposite to the base. /. The altitude is the perpendicular... | |
 | Daniel W. Fish - Arithmetic - 1883 - 348 pages
...angle opposite. 460. A trigon or triangle is a polygon bounded by three sides, having three angles. c The base of a triangle is the side on -which it is supposed to stand, as AB ; the vertical angle is the angle opposite the base, as С ; and the altitude... | |
 | Alfred Hix Welsh - Geometry - 1883 - 326 pages
...equal each to each. 10. The Hypotenuse of a right triangle is the side opposite the right angle. 11. The Base of a triangle is the side on which it is made to stand as, A B. 12. The angle opposite the base is called the Vertical Angle, as c. 13. A Broken... | |
 | Andrew Jackson Rickoff - Arithmetic - 1886 - 688 pages
...in. wide and 18 in. long ? 393. A plane figure bounded by three straight lines is a triangle. 394-. The base of a triangle is the side on which it is supposed to rest. (Any side of a triangle may be taken for its base.) 395. The altitude of a triangle... | |
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The Altitude of a triangle is the perpendicular distance from the angle opposite the base to the base, or to the base produced or extended. 
