大圆的半径是小圆的6倍,小圆周长是大圆的 ,大圆面积是小圆面积的 .
= ÷32=( 0.125 )填小数=6:( )=12.5%.
== :32=15÷ = (填小数)
=18: =0.6== %= 折.
÷6=6: =1.5= %
15÷ ===1=1.25.