Illustration used to construct a circle when given three points.

Illustration used to show how to divide a line into any number of equal parts by construction.

Illustration used to draw a an ellipse using string and pins by describing a circles with diameters…

Illustration used to draw a an ellipse with major axis AB and minor axis CD.

Illustration used to draw a parabola when given the base and height.

Illustration used to draw lines which are radii of a circle where the center is inaccessible.

Illustration used to construct a square that shall be a multiple of any given square.

Illustration used to construct a square that shall be in proportion to a given square.

Illustration used to construct a square that shall be in proportion to a given square.

Illustration used to construct a triangle given the length of the base and the two base angles.

Illustration used to construct an equilateral triangle on a given base.