The image depicts an interior view of a classroom in Dimitrovgrad, Bulgaria, focusing on a whiteboard and a desk

The image depicts an interior view of a classroom in Dimitrovgrad, Bulgaria, focusing on a whiteboard and a desk. A large white whiteboard is mounted on a light green wall, beneath a horizontal dual-tube fluorescent light fixture. A small, beige motion sensor is affixed to the wall above the light. The whiteboard is extensively covered with mathematical equations and problems handwritten in black marker, primarily in Cyrillic. Headings include "Формули за лице на $\Delta$" (Formulas for the area of a triangle), "③ Зад" (Problem 3) listing triangle side lengths (a=5cm, b=6cm, c=7cm), and calculations for area (S) and circumradius (R) using the formula S = a.b.c / 4R. Specific calculations like R = 35.$\sqrt{6}$ / 24 are visible. The top right corner of the whiteboard displays "Д.Р." and "стр. 129 / 3 и 4," indicating a possible homework assignment or textbook reference. Below the whiteboard, a white desk with an orange front edge is visible. A blue, textured fabric pencil case with a black zipper lies on the desk. In the lower right foreground, a portion of a light-colored, plush fabric, likely from a chair cushion or clothing, is present. No individuals are directly visible.