五边形ABCDE的内角和:(5-2)*180=540(度)
540÷(2+3+4+5+6)=27(度)
角A:27*2=54(度)
角B:27*3=81(度)
角C:27*4=108(度)
角D:27*5=135(度)
角E:27*6=162(度)