American text books of art education : Geometrical drawing (1873)
Smith, Walter, 1836-1886 · Boston : James R. Osgood & Co. · leaf 19
The Circle. Def. 35. A tangent, as A B, is a straight line■which touches the circumference of a circle, butdoes not cut it. A tangent is always at right angles to a radius,as D C, drawn from the point of contact D. Draw a circle and two tangents to it. … Def. 36. A diar/onal of a quadrilateral or four-sided ficrure is a line joining opposite angles, asA B. Def. 37. A diameter of a parallelogram is aline drawn through the centre of the figure, andparallel to two of its sides, as C D. Draw a square, its diameter and diagonals.
Geometrical drawing
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