圆柱的侧面沿一条高展开后是一个 或 .当圆柱的高和底面周长相等时,圆柱的侧面展开是 .
=0.25=4÷ = :28= %
12÷ ==== %= 折.
5: ==1.25=30÷ = %
1==3÷ = : = %= (填小数).
=2: =4÷ = %=0.4.