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Surround the city with a 48 cm long wire, a cuboid frame, 6 cm long, 3 cm wide, how many cm high? How many sides of the cuboid are equal at most?
H = 48 △ 4-6-3 = 3cm
The cuboid has at most four equal faces
Use the same length of wire to form the following figure, () has the largest area
A. Triangle B. square C. rectangle D. circle
D
What is the largest area of the figure enclosed with wire?
Round
With the same area, the circumference of a circle is about 0.785 times that of a square
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