Question

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

Answer 1

Answer:

option b. $EF:AD=2:1$

Step-by-step explanation:

we know that

In a circle the ratio of the diameter to the radius is equal to $2:1$

because

$D=2r$

$2r/r=2:1$

so

In this problem

EF is a diameter

AD is a radius

therefore

$EF:AD=2:1$

Answer 2

I hope this helps you