A school geometry. containing the substance of Euclid books II anfd III and part of book IV (1917)
Hall, H. S. (Henry Sinclair), 1848-1934, Stevens, F. H. (Frederick Haller), 1852-1933 · London : Macmillan · leaf 77
ngle, the centre falls on the hj^otenuse :if it is an obtuse-angled triangle, the centre falls without thetriangle. Note. From page 94 it is seen that if S is joined to the middlepoint of BC, then the joining line is perpendicular to BC. Hence the perpendicidars drawn to the sides of a triangle… … Let ABC be the triangle, in which a circle is to be inscribed. Construction. Bisect the ^ABC, ACB by the st. lines Bi,CI, which intersect at I. Proh. 1. Then I is the centre of the required circle. Proof. From I draw ID, IE, IF perp. to BC, CA, AB. Then every point in Bl is equidistant from BC, BA;…
Geometry
Internet Archive · Western University Libraries · Public Domain Mark 1.0. Free to use for anything.
