A decorative letter C with an angel holding a vine below the letter.

The illustration of writing the Inclined Capital letter C using proper strokes.

An illustration of composite rectangle with lengths a, b, and c with area ac + bc. This illustration…

"The Actual Size of the Test Type, which shiykd be seen by the Normal Eye at a distance of Twenty Feet."…

"Thermometers showing the corresponding points for water's freezing and boiling." -Avery 1895

Right triangle ABC with angles A, B, C labeled and leg of 13 with hypotenuse of 15.

Right triangle ABC with angles A, B, C to be used for finding distance across a river. This is a trigonometry…

Right triangle ABC with a base angle of 67 degrees 4208 minutes and a hypotenuse of 23.47 ft.

Right triangle ABC with a leg of 23.85 feet and a hypotenuse of 35.62 feet.