The structural shape of DNA can be
described as a?

DNA is made up of molecules called nucleotides. Nucleotides are attached together to form two long strands that spiral to create a structure called a double helix. If you think of the double helix structure as a ladder, the phosphate and sugar molecules would be the sides, while the bases would be the rungs.

Explanation:

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Step-by-step explanation:

use Pythagorean theorem:

a² + b² = c²

where a = 2

           b = x/2  

           c = √13

plugin values into the formula:

2² + (x/2)² = (√13)²

4² + x² = 13

       4

16 + x² = 13 (4)

x² = 52 - 16

x = √36

x = 6