量出下面图形中∠1、∠2的度数,写出互相平行和互相垂直的线段.
= :24=5:8= :40= %
3÷ ==0.75=6: = %
3÷ ==0.6=6: = %.
3:5==9: == .
=0.375=12÷ = %=0.45= %= ÷ .