How long does it take to make a 10 cm long, 5 cm wide and 3 cm high rectangular frame with iron wire?

How long does it take to make a 10 cm long, 5 cm wide and 3 cm high rectangular frame with iron wire?

Let the length of the wire be L
The required wire length is the perimeter of the cuboid
L=4(a+b+h)=4×(10+5+3)=4×18=72cm
Answer: need wire length 72 centimeters

How long does it take to make a cuboid frame of 10 cm long, 5 cm wide and 3 cm high with iron wire
There has to be a formula,

(10 + 5 + 3) X4 = 72cm

Use 120 meters of iron wire to make a cuboid frame. The ratio of length, width and height is 3:2:1. What are the length, width and height of the cuboid?

The sum of length, width and height of a cuboid: 120 △ 4 = 30 (CM), total number of parts: 3 + 2 + 1 = 6 (CM), length: 30 × 36 = 15 (CM), width: 30 × 26 = 10 (CM), height: 30 × 16 = 5 (CM). A: the length, width and height of this cuboid are 15 cm, 10 cm and 5 cm respectively