Question

In the image, point A marks the center of the circle. Which two lengths must form a ratio of 1 : 2?

Answer 1

Answer:

the answer is D

Step-by-step explanation:

Answer 2

Answer: AI:EF

Step-by-step explanation:

1. By definition, the diameter of a circle is twice the radius, then:

D=2r

Where D is the diameter and r is the radius:

2. The AI is the lenght of the radius of the circle and EF is the length of the diameter of the circle. Keeping this on mind you have:

$\frac{AI}{EF}=\frac{r}{D}=\frac{r}{2r}=\frac{1}{2}$ or 1:2

3. Then, AI and EF form the ratio:

1:2