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Page 7 - CIRCLES. A circle is a plane figure bounded by a curved line, every point of which is equally distant from a point within called the center. The curve which bounds the circle is called the circumference.
Page 12 - A sphere is a solid bounded by a curved surface, every point of which is equally distant from a point within called the center.
Page 9 - In order to obtain accurate measurements each degree is divided into 60 equal parts called minutes and each minute into 60 equal parts called seconds.
Page 11 - A cone is a solid bounded by a conical surface and a plane which cuts the conical surface. The plane is called the base and the curved surface the lateral area.
Page 19 - Proof. If two straight lines are cut by a third making the corresponding angles equal, the lines are parallel.
Page 38 - In Fig. 5 draw all arcs first and then draw the straight lines meeting these arcs. It is much easier to draw straight lines meeting arcs, or tangent to them, than to make the arcs tangent to straight lines. As this exercise is difficult, and in all mechanical and machine drawing arcs and tangents are frequently used, the beginner is advised to draw this exercise several times.