The straight line joining the middle points of two sides of a triangle is parallel to the third side and equal to half of it 46 INTERCEPTS BY PARALLEL LINES. Euclid - Page 99by Euclid, Rupert Deakin - 1903 - 164 pagesFull view - About this book
| Webster Wells - Geometry - 1894 - 400 pages
...bisects AC. A line drawn from D to the middle _ point of AC will be parallel to BC. [The line joining **the middle points of two sides of a triangle is parallel to the third side.]** (§ 130.) Then this line will coincide with DE. [But one straight line can be drawn through a given... | |
| Wooster Woodruff Beman, David Eugene Smith - Geometry - 1895 - 346 pages
...through the vertex, th. 27 or cor. 1 proves it. Draw the figure. 3. The line joining the mid-points **of two sides of a triangle is parallel to the third side.** For if not, suppose through the mid-point of one of those sides a line is drawn parallel to the base... | |
| Wooster Woodruff Beman, David Eugene Smith - Geometry - 1895 - 344 pages
...through the vertex, th. 27 or cor. 1 proves it. Draw the figure. 3. The line joining the mid-points **of two sides of a triangle is parallel to the third side.** For if not, suppose through the mid-point of one of those sides a line is drawn parallel to the base... | |
| George Albert Wentworth - Mathematics - 1896 - 68 pages
...parallel to the base of a triangle, and bisecting one side, bisects the other side also. 189. Cor. 2. The **line which joins the middle points of two sides of a triangle is parallel to the third side, and** is equal to half the third side. 190. Cor. 3. The line which is parallel to the bases of a trapezoid... | |
| University of the South - 1896 - 148 pages
...whose sides are perpendicular, each to each, are either equal or supplementary. (2) The line joining **the middle points of two sides of a triangle is parallel to the third side, and equal to** one-half of it. (3) The angle between a tangent and a chord is measured by one-half its intercepted... | |
| George D. Pettee - Geometry, Modern - 1896 - 272 pages
...polygon is equal to four right angles. 44 PLANE GEOMETRY PROPOSITION XXXI 113. Theorem. The line joining **the middle points of two sides of a triangle is parallel to the third side and equal to** one-half of it. Appl. Cons. Dem. I = 1 II = II Prove DE II AC and = Draw CFIIAB, meeting DE produced... | |
| Andrew Wheeler Phillips, Irving Fisher - Geometry, Modern - 1896 - 276 pages
...bisecting one side bisects the other also. Hint.— Apply § 127. 130. Exercise — A straight line joining **the middle points of two sides of a triangle is parallel to the third side.** Hint. — Show that this line coincides with a line drawn as in § 129. 131. Exercise. — A straight... | |
| Andrew Wheeler Phillips, Irving Fisher - Geometry - 1896 - 570 pages
...one side bisects the other also. A Hint. — Apply § 127. 130. Exercise — A straight line joining **the middle points of two sides of a triangle is parallel to the third side.** Hint. — Show that this line coincides with a line drawn as in § 129. /-'•'/. Exercise. — A straight... | |
| Frederick Harold Bailey - Geometry, Analytic - 1897 - 392 pages
...are taken does . ,; .not affect the result. ^<--- - . t 43. Prove analytically that the line joining **the middle points of two sides of a triangle is parallel to the third side ; and equal to** one half of it. • ]fS^S"' I •+• , . , * .- /* ', s \ THE POINT. 21 45. Prove analytically that,... | |
| Henry W. Keigwin - Geometry - 1897 - 254 pages
...bisector, (X is Y) Therefore the right bisector is the median. ( Y is X) 124. THEO. The line joining **the middle points of two sides of a triangle is parallel to the third side.** 125. THEO. Converse of § 124. 126. THEO. The line o/§ 124 is equal to one half the third side. 127.... | |
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