 | Julius J. H. Hayn - Geometry, Plane - 1925 - 328 pages
...equilateral triangle, divide it into four smaller equilateral triangles. 5. Prove that the bisector of the vertical angle of an isosceles triangle is perpendicular to the base, and bisects the base. 6. Prove that two isosceles right triangles are equal, if the hypothenuse in... | |
 | Education - 1896 - 606 pages
...principles: i. The three bisectors of the angles of a triangle meet in a point; 2. The bisector of the vertical angle of an isosceles triangle is perpendicular to the base. Algebra. — i. 8x — 2. 2. a+ai. 3. (2х + 7)2-6(2х + 7) = 55- "Completing the square" gives: (2X... | |
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The straight line which bisects the vertical angle of an isosceles triangle is perpendicular to the base. 
