Elements of geometry : containing books I to VI and portions of books XI and XII of Euclid, with exercises and notes (1881)
Smith, J. Hamblin (James Hamblin), 1829-1901, Kirkland, Thomas, 1835-1898 · Toronto : W.J. Gage · leaf 157
r than tworight angles, and this we call a Reflex Angle. To assist the learner, we shall mark these angles with dottedlines in the diagrams. Admitting the existence of angles, equal to and greater thantwo right angles, the Proposition last proved may be extended,as we now proceed to shew, ISO… … In the ® ACBD, let the angles AOB (not less than tworight angles) at the centre, and ADB at the circuniference, besubtended by the same arc ACB. Then must l AOB = twice l ADB.Join DO, and produce it to meet the arc ACB in (. Then •.• z AOC=tv^ice z ADO, III. 20. and / BOC= twice z BDO, III. 20. .-.…
Geometry · Geometry, Plane
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