# An elementary treatise on geometrical drawing

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### Innhold

 Del 1 7 Del 2 11 Del 3 21 Del 4 68
 Del 5 75 Del 6 76 Del 7 82 Del 8 99

### Populære avsnitt

Side 24 - All the interior angles of any rectilineal figure, together with four right angles, are equal to twice as many right angles as the figure has sides.
Side 81 - PF'/PH' = e, by definition of the curve. Furthermore :f (6) PF + PF' = 2a. In fact, the ellipse is often defined as the locus of a point which moves so that the sum of its distances from two fixed points is constant.
Side 17 - To draw a straight line at right angles to a given straight line, from a given point in the same.
Side 62 - UPON a given straight line to describe a segment of a circle containing an angle equal to a given rectilineal angle.
Side 36 - Cut off from a given triangle a fourth, fifth, sixth, or any part required by a straight line drawn from a given point in one of its sides.
Side 16 - At a given point in a given straight line to make an angle equal to a given angle.
Side 66 - To construct a circle which shall pass through two given points and touch a given straight line.
Side 23 - PROBLEM. To inscribe a circle in a given triangle. Let ABC be the given triangle : it is required to inscribe a circle in the triangle ABC.
Side 68 - Find a point in a given straight line, such that the sum of its distances from two fixed points on the same side of the line is a minimum, that is, less than the sum of the distances of any other point in the line from the fixed points. Taking the diagram of the last example, suppose CD to be the given line, and A, B the given points. Now if A and A...
Side 34 - A tangent to a circle is a straight line which meets the circumference, but being produced, does not cut it.