The perimeter of the rectangle is 
The perimeter of the two rectangle is 
The perimeter of the three rectangle is 
The relationship between the number of rectangle and the perimeter is 
Further explanation:
The perimeter the rectangles can be obtained as follows,

Given:
Explanation:
The perimeter of one rectangle can be obtained as follows,

The perimeter of the rectangle is 
The perimeter of one triangle can be obtained as follows,

The perimeter of the two rectangle is 
The perimeter of one triangle can be obtained as follows,

The perimeter of the three rectangle is 
The relationship between the number of triangles and the perimeter can be expressed as follows,

Here,
represents the number of sides.
The relationship between the number of triangles and the perimeter is 
Learn more:
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Answer details:
Grade: High School
Subject: Mathematics
Chapter: Rectangle
Keywords: Number, relationship, rectangles, perimeter, number of rectangles, 2 rectangles, 3 rectangles, table, between the sides, represents.