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The image shows a person writing on a whiteboard in a classroom setting, likely in Sofia, Bulgaria (based on the Cyrillic alphabet used in the text). The person, wearing a gold watch, is using a marker to write mathematical formulas. The whiteboard has the inscription "5-ти клас" (meaning "5th grade"). Below this are written formulas for the area of a triangle: "S△ABC = a*ha/2" and "S△ABC = 54,2". A whiteboard eraser is visible on the right edge of the board. The classroom walls are painted in light colors.
Andgi

Apr 8, 2026

Sofia, Bulgaria

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The image shows a person writing on a whiteboard in a classroom setting, likely in Sofia, Bulgaria (based on the Cyrillic alphabet used in the text). The person, wearing a gold watch, is using a marker to write mathematical formulas. The whiteboard has the inscription "5-ти клас" (meaning "5th grade"). Below this are written formulas for the area of a triangle: "S△ABC = a*ha/2" and "S△ABC = 54,2". A whiteboard eraser is visible on the right edge of the board. The classroom walls are painted in light colors.

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Andgi

Apr 8, 2026

Sofia, Bulgaria

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