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### Innhold

 The angle 105 27 To describe a rightangled triangle when 1 To draw a perpendicular to a straight line from a point within it 3 CHAPTER II 10 To draw a perpendicular to a straight line from the end of 19 CHAPTER III 20 construct a triangle with angles 72 72 36 note on angle 18 26 Case II of the same proposition 53 Given the altitude 34 SIMILAR FIGURES 46
 of chords 70 internally by the other 70 To draw a circle of given radius 73 without producing the line and 20 to draw it when the given point 75 CHAPTER XII 78 To find a figure similar to a given one and bearing a given 84 Heptagon in a circle 102 Octagon in a circle 103 101 to 105 to 129 To describe an ellipse 130 To find the centre 127

 To inscribe a circle in a given triangle 48 To circumscribe 47 To describe about a given circle a triangle the angles of which 54 To draw two external tangents to two given circles 66 65
 CHAPTER XVI 137 to 176 Orthographic projection and sections of solids 163