Question

select the correct answer from each drop - down menu.
point a is the center of this circle.
the ratio of the lengths of to is 2:1.

Explanation:

Step1: Identify circle components

Point A is the center, so $AD$ is a radius. $EF$ passes through A, so it is a diameter.

Step2: Relate diameter and radius

By circle properties, diameter length = $2\times$ radius length. So $\text{Length of } EF = 2\times\text{Length of } AD$, which gives the ratio $\frac{EF}{AD}=\frac{2}{1}$.

Answer:

The ratio of the lengths of EF to AD is 2:1.