Abstract: A plotter apparatus inscribes a polygon in a circle, and includes a ruler body, a first slider, a second slider, multiple brachiums, and a nib member. The ruler body comprises a knap, and a first ruler groove and a second ruler groove to allow movement of the first slider and the second slider. The brachiums are connected across the ruler body via pivots. The nib member allows the drawing of the circle. A fourth brachium is attached to a predetermined numbered hole on a second and a third brachium as per the number of sides required on the polygon. The length of each side of the polygon is retrieved between the knap and a slider. Cyclic arcs, with the determined length as a length of one side of the polygon, are drawn along the circumference of the circle. The arc intersections on the circle are joined together to define the polygon.

Abstract: A geometric divider divides a dimension into equal portions. The geometric divider comprises multiple brachiums, a set of grooves on a first brachium and a second brachium, and multiple slots on at least two brachiums. A base brachium is pivotally connected to a first brachium and a second brachium. A third brachium is configured to slide across the grooves, and corresponding ends of each brachium define multiple mouthpieces to measure the dimension. Each slot is numbered, and a first mouthpiece defined by the base brachium and the first brachium is configured to enclose on the dimension. The third brachium is configured to be selectively pinned in a predetermined numbered slot to determine the number of equal portions to which the dimension is to be divided. An intersection of the third brachium on the dimension divides the dimension to generate a first portion of the equal portions of the dimension.