a²+b²-8a-10b+41=0
(a-4)²-16+(b-5)²-25+41=0
(a-4)²+(b-5)²=0
所以a=4,b=5;
腰=a=4,周长=2a+b=2*4+5=13;
腰=b=5,周长=2b+a=2*5+4=14;