| John Charles Snowball - 1837
...С); Again, since each of the angles A, B, С is less than тг, .-. A + B + С<3тг. 22. The angles **at the base of an isosceles triangle are equal to each other.** (Fig. Art. 28.) Suppose ABC to be an isosceles triangle, having AB = AC, and therefore ¿ AOB = z AOC.... | |
| Thomas Holliday - 1838 - 80 páginas
...perpendicular is the shortest straight line that can be drawn from the vertical angle to the base. Note **1. The angles at the base of an isosceles triangle are equal to each other. 2.** A line drawn from the middle of the base of an isosceles triangle to the opposite angle is perpendicular... | |
| 1844
...horizon, in the same plane with it, are observed ; to find the distance between them. 1842. GEOMETRY. **1. The angles at the base of an isosceles triangle are equal to** one another ; and if the equal sides be produced, the angles on the other side of the base are equal.... | |
| Euclides - 1845
...of the one equal to two sides, &c. Which was to be demonstrated. PROPOSITION V. THEOREM. The angles **at the base of an isosceles triangle are equal to each other;** and if the equal sides be produced, the angles on the other side of the base shall be equal. Let ABC... | |
| Alpheus Crosby - 1847 - 164 páginas
...? a scalene triangle ? In the general proposition above are included the following particulars : ( **1 . ) The angles at the base of an isosceles triangle are equal.** (2.) A triangle which has two equal angles is isosceles. (3.) An equilateral triangle is also equiangular.... | |
| J. Goodall, W. Hammond - 1848
...Draw a straight line perpendicular to a given straight line from a given point in it. 3. The angles **at the base of an isosceles triangle are equal to each other,** and if the equal sides be produced the angles on the other side of the base shall be equal. SECTION... | |
| 1848
...it. — See " Bell's Euclid," prop. i. book i. ; or " Tate's Geometry," &c. page 21. 3. The angles **at the base of an isosceles triangle are equal to each other,** and if the equal sides be produced, the angles on the other side of the base shall be equal. — See... | |
| Great Britain. Council on Education - 1848
...one side of it are either two right angles, or are together equal to two right angles. 2. The angles **at the base of an isosceles triangle are equal to each other.** 3. Define parallel straight lines. State the axiom which you assume respecting such lines; and explain... | |
| Great Britain. Committee on Education - 1848
...one side of it are either two right angles, or are together equal to two right angles. 2. The angles **at the base of an isosceles triangle are equal to each other.** 3. Define parallel straight lines. State the axiom which you assume respecting such lines ; and explain... | |
| 1863
...; prove that AC and BD bisect each other. Under wht circumstances will AC equal BD ? 8. The angles **at the base of an isosceles triangle are equal to each other.** Give Euclid's proof of this proposition. How might it be proved if you were permitted to bisect an... | |
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