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A piece of iron wire can just form a square with a side length of 6cm. If the length is changed to 1m, how about the rectangular area?
6cm = 0.06m
0.06x1 = 0.06m2
Use a piece of iron wire to make a square with a side length of 24 cm. If you use this piece of iron wire to make a 30 cm long rectangular line, then this rectangular line is not very long
How many centimeters is the width
(24x4-30x2) △ 2 = 18 (CM)
A piece of iron wire can encircle a rectangle of 2 decimeters long and 12 centimeters wide. If this iron wire is used to encircle a square, its area will be smaller
Rectangle length: 20 cm rectangle width: 12 cm rectangle perimeter (that is, the length of the wire) = length widening times two (20 + 12) * 2 = 64 (CM). For the same wire, the perimeter is the same, and the side length of the square is calculated by the perimeter. The perimeter of the rectangle (the length of the wire) divided by 4 equals the length of one side of the square: 64 / 4 = 16 (mm
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