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 69
ce of the radii of the given circles, describe a circle,and draw BC to touch it. Join AC, and produce it to meet the circle (A) at D.Through B draw the radius BE par to AD and in the samesense. Join DE. Then DE is a common tangent to the given circles. Ohs. Since two tangents, such as BC, can in… … Again, if the circles are eriernal to one anotJier two morecommon tangents may be drawn. Analysis. In this case we may suppose DE to touch thecircles at D and E so that the radii AD, BE fall on opposite sidesof AB. Then BC, drawn par^ to the supposed common tangent DE,would meet AD pnoduced at C;…
Geometry
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