• Euclid I.1 (Geometer's Sketchpad)

    On a given finite straight line to construct an equilateral triangle.

  • Euclid I.1 (HTML Canvas)

    On a given finite straight line to construct an equilateral triangle.

  • Euclid I.2

    To place at a given point (as an extremity) a straight line equal to a given straight line.

  • Euclid I.3

    Given two unequal straight lines, to cut off from the greater a straight line equal to the less.

  • Euclid I.4

    If two triangles have the two sides equal to two sides respectively, and have the angles contained by the equal straight lines equal, they will also have the base equal to the base, the triangle will be equal to the triangle, and the remaining angles will be equal to the remaining angles, respectively, namely those which the equal sides subtend.