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25 cm2 + 36 cm2 = c kwadrat
61 cm2 = c kwadrat
c = pierwiastek z 61
obwód = 4 * bok rombu = 4 * pierwiastek z 61 =4 pierwiastki z 61
a²=25+36
a²=61
a=√61
O=4√61
5²+6²=c²
25+36=c²
c=√61
Obw=4a=4*√61=4√61