Lastnosti in vrste štirikotnikov, Miran Kučer

Viri: https://www.google.com/imgres?imgurl=https%3A%2F%2Fh5p.splet.arnes.si%2Ffiles%2F2023%2F04%2Fstirikotniki_nalsovna-720×340.jpg&tbnid=8U_ncfSZ7Z8OOM&vet=12ahUKEwiWzL-lpP6CAxUg_bsIHVOoCCsQMygBegQIARBZ..i&imgrefurl=https%3A%2F%2Fh5p.splet.arnes.si%2Ftag%2Fstirikotniki%2F&docid=WFqBkusJ3_HsMM&w=720&h=340&itg=1&q=vrste%20%C5%A1tirikotnikov&hl=en&ved=2ahUKEwiWzL-lpP6CAxUg_bsIHVOoCCsQMygBegQIARBZ