Idon't understand this i need someone to explain the answer

So,

Proportion basically means, that something is proportional

Example: A rope's length and weight are in proportion.

It's in proportion because the longer the rope, the more the weight

so, let's say

A popcorn machine costs 20 an hour

And in order to rent one, you have to pay $32 dollars

So you pay 32 for the machine, then 20 for every hour you use it

the number of hours used WOULD be proportional to the cost because

the more hours used, the more the cost

your final YES it is proportional

answer: both chords and diameters have two endpoints on a circle. diameters must intersect the center of a circle.