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2011b.00386 Kosztol\'anyi, J\'ozsef Observe and use symmetry! (Vegy\"uk \'eszre \'es haszn\'aljuk a szimmetri\'at!) Polygon 18, No. 1, 71-81 (2009). 2009 Polygon szerkesztoesege, Szeged HU D50 symmetry causability geometrical symmetry problem solving mathematical structure of problem Everybody could observe the symmetry in some mathematical problems. The author chooses four possibilities among these case. The use of the symmetry gives the following advantages in these case: (1) the problem is symmetric or we could transform it to a symmetrical one; (2) we could easier do the operations or get the results with symmetry; (3) the principle of not sufficient causality; (4) the assurance of the generality with the help of symmetry. The author of the article examines these cases through concrete examples. Andr\'as Kov\'acs (Debrecen)