Created on 2024-02-06

The image appears to be a hand-drawn sketch accompanied by handwritten notes, possibly from a mathematics or geometry lesson. The sketch shows a square with a circle inscribed within it; the circle touches all four sides of the square at their midpoints. It seems the square is divided along both diagonals and also horizontally and vertically from the center, creating eight right triangles within the square. At the center of the square, where the diagonals intersect, there's a dot which likely represents the circle's center, which is also the common vertex to all triangles. The handwritten notes above the sketch say: "This simple angular base of reference must be thought of as a right-angle of unit radius." Below the sketch, the note says: "All points exterior to its vertex are directly comparable, by angle, to the unit angle." These notes suggest that this diagram might be used as a reference for explaining concepts related to angles, units of measure for angles, or the geometric properties of figures.

Created on 2024-03-30

The image appears to be a diagram or drawing along with handwritten text. The diagram shows various geometric shapes, including circles, squares, and lines, arranged in a specific pattern. The handwritten text discusses the angular base of a reference and describes it as a right-angle or similar to a unit radius. The text also mentions that all the points exterior to the vertex are directly comparable by an angle to the unit angle.