 | George Edward Atwood - Arithmetic - 1902 - 168 pages
...6 cents a pound ? AREA OF TRIANGLES A Triangle is a plane figure bounded by three straight lines. * The Base of a triangle is the side on which it is supposed to stand. The Vertical Angle of a triangle is the angle opposite the base. The Vertex of an... | |
 | Samuel Hamilton - Arithmetic - 1908 - 512 pages
...parts with chalk. How many angles are there in each part ? how many right angles ? THE RIGHT TRIANGLE A right triangle is a triangle having one right angle....the right. 4. Fold a rectangular piece of paper, as ABOD, on its diagonal. Observe : (1) That the rectangle AB CD and the triangle ABD have the same base... | |
 | School of Railway Signaling (Utica, N.Y.) - Railroads - 1910 - 446 pages
...angles are acute. Fig. 84. Fid. 83 84. An obtuse triangle when one of the angles is obtuse. Fig. 85. 85. The base of a triangle is the side on which it is supposed to stand. The equal sides of an isosceles triangle are known as the legs and the third side... | |
 | Robert Louis Short, William Harris Elson - Mathematics - 1910 - 202 pages
...the included angle of the other. ) 9. But A AFB is the same as A DEF. 10. Hence, A DEF= A ABC. NOTE. The base of a triangle is the side on which it is supposed to rest. Any side may be considered the base. The altitude is a perpendicular (ยง 7.'5) from... | |
 | Samuel Hamilton - Arithmetic - 1913 - 338 pages
...divides the rectangle into two triangles. A triangle is a surface bounded by three straight lines. A right triangle is a triangle having one right angle....the line that meets the base line at a right angle. PRACTICAL MEASUREMENTS 2. Point out the base and the altitude in the triangles at the right. 3. Fold... | |
 | Otto Luhr - Air conditioning - 1913 - 982 pages
...triangle has all three sides of equal length. An isosceles triangle has only two sides of equal length. The base of a triangle is the side on which it is supposed to rest. The altitude or height of a triangle is a straight line drawn perpendicular to the... | |
 | Claude Irwin Palmer, Daniel Pomeroy Taylor - Geometry, Plane - 1915 - 320 pages
...opposite the right angle is the hypotenuse. A In the right triangle ABC, AC is the hypotenuse. 81. The base of a triangle is the side on which it is supposed to rest. In the triangle ABC, BC is the base. In an isosceles triangle, which has two sides... | |
 | Samuel Hamilton - Arithmetic - 1917 - 312 pages
...divides the rectangle into two triangles. A triangle is a surface bounded by three straight lines. A right triangle is a triangle having one right angle....have each pupil, if possible, get a right triangle, like the one here represented. 2. Point out the base and the altitude in the triangles at the right.... | |
 | Samuel Hamilton - Arithmetic - 1917 - 328 pages
...divides the rectangle into two triangles. A triangle is a surface bounded by three straight lines. A right triangle is a triangle having one right angle....the line that meets the base line at a right angle. PRACTICAL MEASUREMENTS 2. Point out the base and the altitude in the triangles at the right. 3. Fold... | |
 | Samuel Hamilton - Arithmetic - 1917 - 406 pages
...by three straight lines. (Tri means three.^) A vertex of a triangle is a point where two sides meet. The base of a triangle is the side on which it is supposed to rest. The altitude of a triangle is the perpendicular distance from the vertex opposite... | |
| |
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. 
