 | Charles Austin Hobbs - Geometry, Plane - 1899 - 266 pages
...6. If two vertical angles are bisected, the bisectors lie in the same straight line. TRIANGLES. 16. A triangle is a portion of a plane bounded by three straight lines. The bounding lines are called the sides of the triangle, and their sum is called the perimeter of the... | |
 | George Albert Wentworth - Geometry, Modern - 1899 - 272 pages
...same side of the transversal are supplementary, the two straight lines are parallel. TRIANGLES. 117. A triangle is a portion of a plane bounded by three straight lines ; as, ABC (Fig. 1). The bounding lines are called the sides of the triangle, and their sum is called... | |
 | George Albert Wentworth - Geometry, Solid - 1899 - 246 pages
...transversal, if the exterior-interior angles are equal, these two straight lines are parallel. 117. A triangle is a portion of a plane bounded by three straight lines. The- bounding lines are called the sides of the triangle, and their sum is called the perimeter ; the... | |
 | George Albert Wentworth - Geometry - 1899 - 496 pages
...transversal are supplementary, the two straight lines are parallel. BOOK I. PLANE GEOMETRY. TRIANGLES. 117. A triangle is a portion of a plane bounded by three straight lines ; as, ABC (Fig. 1). The bounding lines are called the sides of the triangle, and their sum is called... | |
 | Alan Sanders - Geometry, Modern - 1901 - 260 pages
...that is greater than a right angle is obtuse. An angle that is not a right angle is oblique. . 18. A triangle is a portion of a plane bounded by three straight lines. The lines are called the sides of the triangle, and their angles the angles of the triangle. An equilateral... | |
 | George Albert Wentworth - Geometry, Solid - 1902 - 246 pages
...transversal, if the exterior-interior angles are equal, these two straight lines are parallel. 117. A triangle is a portion of a plane bounded by three straight lines. The bounding lines are called the sides of the triangle, and their sum is called the perimeter; the... | |
 | Philip Devereux Johnston - Mechanical drawing - 1903 - 220 pages
...right angles can be formed about a given point, it follows that each right angle is equal to 90°. 23 A Triangle is a portion of a plane bounded by three straight lines. 24 A Scalene triangle is one which 25 An Isosceles triangle is one which has two sides equal. 26 An... | |
 | John William Hopkins, Patrick Healy Underwood - Arithmetic - 1903 - 578 pages
...meridian, if your local time is faster than your Standard time? CHAPTER XIV MEASUREMENTS AND VALUES 241. A triangle is a portion of a plane bounded by three straight lines, triangle. ABC is a 242. Two straight lines are parallel if they can never meet no matter how far they... | |
 | George Albert Wentworth - Geometry - 1904 - 496 pages
...transversal are supplementary, the two straight lines are parallel. BOOK I. PLANE GEOMETRY. TRIANGLES. 117. A triangle is a portion of a plane bounded by three straight lines; as, ABC (Fig. 1). The bounding lines are called the sides of the triangle, and their sum is called... | |
 | Fletcher Durell - Geometry - 1911 - 553 pages
...one perpendicular can be drawn from P to AB. _ ___ _ Q. E, D. BOOK I. PLANE GEOMETRY TRIANGLES 81. A triangle is a portion of a plane bounded by three straight lines, as the triangle ABC. 82. The sides of a triangle are the lines which bound it; the perimeter of a triangle... | |
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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. 
