If tied into two layers, the length of the line is 4 arcs and 4 segments.

Four arcs form a circle with a circumference of 3.14×10 = 31.4cm.

4 segments, each segment is 10 cm,1* *10× 4 = 40cm.

Therefore, the length of each turn of wire is 3 1.4+40 = 7 1.4 cm.

Tie it twice, and you need 7 1.4×2= 142.8 cm wire.

If there is, it will be bundled into 1 layer.

The length of the wire is the upper and lower sections and two semicircles at both ends.

The lengths of the upper and lower line segments are 10× 3 = 30cm respectively.

The two semicircles at both ends form 1 circle, and the circumference is 3.14×10 = 31.4.

The length of a circle is 30×2+3 1.4=9 1.4 cm.

It takes 9 1.4× 2 = 182.8cm to bind twice.