Inteoduction. 17 that are constructed. Two forms of the protractor arehere given. Its use is evident. In the first form the … graduations are at equal intervals, since, as will sub-sequently be shown, in a circle equal arcs subtend equalangles at the centre. 20. An angle Jess than aright angle, is called an acuteangle. An angle greaterthan a right angle,is called an obtuseangle. Rectilineal Figures. 21. A plane figure is…
Geometry · Geometry, Plane
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