79,350 cm
Explanation:
115x115=13,225 (this is the area of one side)
13,225x6=79,350(a cube has 6 sides)
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Answer:

Step-by-step explanation:

The perimeter of an object is found by adding all of the sides. The sides of his frame would be 2 ft, 2 ft, 1.5 ft (18 inches / 12 inches per foot = 1.5 feet), 1.5 feet. Adding these together we get a total length of 7 feet. However, he may want to use a slightly longer board to account for any errors!