Maybe... the fraction of the rectangle and the large rectangle makes both of them to represent so that they can connect back together again.
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If the sides of a triangle are doubled then the area becomes quadrupled (four times as large).
"Pi" is an irrational number. No series of digits can represent its value exactly, whether written as a fraction or as a decimal. The decimal can be extended to any number of significant figures, no matter how large, and never ends.
All you have to use is the five triangles. The two large triangles make a square in the middle, the two small triangles make a large triangle on one side and the middle triangle on the other side.
measuring the distances
If you multiply the two numbers, you'll get the area in square centimeters. Assuming you are talking about a rectangle, of course.