Gore, James Howard, 1856-1939 · New York, Longmans, Green, and co. · leaf 46
. Show that the three perpendiculars erected at the middle pointsof the three sides of a triangle meet in a point, and this point is equallydistant from the vertices. SUG. See 53. 2. If an exterior angle is formed ateach vertex of a triangle, their sum willbe equal to four right angles. 3. Show… … QUADRILATERALS.DEFINITIONS. 98. A Quadrilateral is a plane figurebounded by four straight lines; as ABCD. 99. The bounding lines are called theSides of the quadrilateral, and their pointsof intersection are called its Vertices
Geometry
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