a – äëèíà ñòîðîíû êâàäðàòà;
– äëèíà äèàãîíàëü êâàäðàòà;
– ïåðèìåòð êâàäðàòà;
S = a 2 , – ôîðìóëû ïëîùàäè êâàäðàòà.