we put a copper wire to wind around the ciecle whose diameter is 30 cm ,just can be wound 12 rings,can you work out the length of the copper?if the perimeter of a rectangle and a square is equal ,if the length of the square is 3.5dm,the length of rectangle is 5 dm,then how long is the width?(answer in meter)if the perimeter of a square is7/2m,use 5/8 of its perimeter,what's the rest meter?the perimeter of a rectangle is 24.8m,the length is 3times than
问题描述：
we put a copper wire to wind around the ciecle whose diameter is 30 cm ,just can be wound 12 rings,can you work out the length of the copper?
if the perimeter of a rectangle and a square is equal ,if the length of the square is 3.5dm,the length of rectangle is 5 dm,then how long is the width?(answer in meter)
if the perimeter of a square is7/2m,use 5/8 of its perimeter,what's the rest meter?
the perimeter of a rectangle is 24.8m,the length is 3times than the width,what's the area of a rectangle?
the perimeter of a rectangle is 24cm,draw a square on its every side,the sum of every new square is 208cm²,what's the area of the original rectangle?
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