 | David Sands Wright - 1906 - 104 ページ
...opposite sides, are equal. 4. The two triangles formed by drawing straight lines from the middle point of the base of an isosceles triangle to the middle points of the equal sides, are equal. 5. The triangles formed, with the base, by the bisectors of the equal angles... | |
 | Webster Wells - 1908 - 208 ページ
...sides of the trapezoid, two pairs of equal triangles. TJTT 42. If lines be drawn from the middle point of the base of an isosceles triangle to the middle points of the equal sides, the triangle is divided into two equal triangles and a parallelogram. POLYGONS DEFINITIONS... | |
 | Henry Sinclair Hall - 1908 - 286 ページ
...in all respects, EXERCISES. ON THE IDENTICAL EQUALITY OF TRIANGLES. 1. Shew that the perpendiculars drawn from the extremities of the base of an isosceles triangle to the opposite sides are equal. 2. Any point on the bisector nf an angle is equidistant from the arms of... | |
 | Webster Wells - 1908 - 329 ページ
...sides of the trapezoid, two pairs of equal triangles. Ex. 42. If lines be drawn from the middle point of the base of an isosceles triangle to the middle points of the equal sides, the triangle is divided into two equal triangles and a parallelogram. POLYGONS DEFINITIONS... | |
 | Webster Wells - 1908 - 336 ページ
...sides of the trapezoid, two pairs of equal triangles. Ex. 42. If lines be drawn from the middle point of the base of an isosceles triangle to the middle points of the equal sides, the triangle is divided into two equal triangles and a parallelogram. POLYGONS • DEFINITIONS... | |
 | Grace Lawrence Edgett - 1909 - 104 ページ
...of a quadrilateral bisect each other. 3. The line that joins the feet of the perpendiculars dropped from the extremities of the base of an isosceles triangle to the opposite sides is parallel to the base. 4. The sum of the acute angles at the vertices of a pentagram... | |
 | George Albert Wentworth, David Eugene Smith - 1910 - 287 ページ
...the two points of intersection are parallel. 35. The line that joins the feet of the perpendiculars drawn from the extremities of the base of an isosceles triangle to the equal sides is parallel to the base. 37. If two consecutive angles of a quadrilateral are right angles,... | |
 | George Albert Wentworth, George Wentworth - 1912 - 602 ページ
...DF. § 185 .-. CE is || to DF, by § 95. QED 35. The line that joins the feet of the perpendiculars drawn from the extremities of the base of an isosceles triangle to the equal sides is parallel to the base. Given the isosceles A ABC with AE and BD drawn _L to the equal... | |
 | George Albert Wentworth, David Eugene Smith - 1913 - 491 ページ
...the two points of intersection are parallel. 35. The line that joins the feet of the perpendiculars drawn from the extremities of the base of an isosceles triangle to the equal sides is parallel to the base. 37. If two consecutive angles of a quadrilateral are right angles,... | |
 | George Albert Wentworth, David Eugene Smith - 1913 - 496 ページ
...the two points of intersection are parallel. 35. The line that joins the feet of the perpendiculars drawn from the extremities of the base of an isosceles triangle to the equal sides is parallel to the base. 37. If two consecutive angles of a quadrilateral are right angles,... | |
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The lines drawn from the extremities of the base of an isosceles triangle to the middle points of the opposite sides are equal. 
