If a circle has diameter $2.25$, then its radius must be half of that which is $1.125$. Thus, both circles have radius $1.125$, so their circumferences must be equal and in a ratio of $\boxed{1:1}$.
Find the ratio of the circumference of a circle with radius 1.125 to the circumference of a circle with diameter 2.25. Express your answer in the form $a:b$ where $a$ and $b$ are relatively prime positive integers.
{'answer': '1:1', 'subject': 'Prealgebra', 'level': 4, 'unique_id': 'test/prealgebra/1845.json'}