 | Charles Davies - 1852 - 344 pages
...; now, supposing the distance to be 130 miles, where on the road will they meet ? MENSURATION. 315. A triangle is a portion of a plane bounded by three straight lines. BC is called the base ; and AD, perpendicular to BC, the altitude. 316. To find the area of a triangle.... | |
 | Charles Davies, William Guy Peck - Mathematics - 1855 - 628 pages
...and consequently having three angles. Triangles are either plane, spherical, or curvilinear. A PLANK TRIANGLE is a portion of a plane bounded by three straight lines ; these lines are called sides, and their points of intersection are the vertices of the triangle. Plane triangles may... | |
 | Charles Davies - Arithmetic - 1866 - 356 pages
...how much did the eldest receive, and what was the amount received by them all ? D MENSURATION. 386. A TRIANGLE is a portion of a plane, bounded by three straight lines. It has three sides and three angles. ,• EC is called, the base; and AD, per- _A_ pendicular to BC,... | |
 | Charles Davies - Arithmetic - 1867 - 354 pages
...distance to be 130 ii:i !'_•i•. where ou the road will they meet? MKNSUEATION. 2J MENSURATION. 315. A triangle is a portion of a plane bounded by three straight lines. BC is called the base ; and AD, perpendicular to BC, the altitude. 316. To find the area of a triangle.... | |
 | Charles Davies, William Guy Peck - Mathematics - 1872 - 602 pages
...angle]. A portion of a surface bounded by three lines, and consequently having three angles. A PLANE TRIANGLE is a portion of a plane bounded by three straight lines ; these lüiea are called MiA.v. and their points of intersection are the vertices of the triangle. Plane triangles... | |
 | Webster Wells - Geometry - 1894 - 398 pages
...drawn through a given point parallel to a given straight line.] (§ 53.) , TRIANGLES. DEFINITIONS. 57. A triangle is a portion of a plane bounded by three straight lines ; as ABC. The bounding lines, AB, BC, and CA, are called the sides of the triangle, and their points... | |
 | Charles Ambrose Van Velzer, George Clinton Shutts - Geometry - 1894 - 416 pages
...the angle ABE is three fourths of a right angle, the angle CBE equals what ? DEFINITIONS. 52. A plane triangle is a portion of a plane bounded by three straight lines. The points of intersection of the bounding lines are called the vertices of the triangle, and the portions... | |
 | John Macnie - Geometry - 1895 - 390 pages
...angles A and A' are the supplements of what angles? Show that these angles are equal. 28 TRIANGLES. 52. A triangle is a portion of a plane bounded by three straight lines. 53. The lines that bound a triangle are called its sides; the angles formed by the sides, its angles;... | |
 | Robert Hunter - 1895 - 712 pages
...and consequently having three angles. Triangles are cither plane, spherical, or curvilinear. A plane triangle is a portion of a plane bounded by three straight lines called sides, and their points of intersection are the vertices of the triangle. Plane triangles may... | |
 | Arthur A. Dodd, B. Thomas Chace - Geometry - 1898 - 490 pages
...unless he has first exhausted his own resources to discover a proof of kis own. TRIANGLES. 19. Def. A triangle is a portion of a plane bounded by three straight lines. Each triangle has three sides and three angles. The vertices of the angles of the triangle are called... | |
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The straight lines are called the sides of the triangle, and their points of intersection are the vertices of the triangle. 
