How do I find the ratio of this? It makes no sense to me

Answer:
[tex]\frac{169}{289}[/tex]
Step-by-step explanation:
Given 2 similar figures with ratio of sides = a : b, then
ratio of areas = a² : b²
Here ratio of sides = 52 : 68 = 13 : 17 ← in simplest form, thus
ratio of areas = 13² : 17² = 169 : 289 = [tex]\frac{169}{289}[/tex]