Does the ratios 13/16 and 1/2 form a proportion?

Which of the following circles have their centers in the third quadrant?

For the chance to be team captain, the numbers 1-30 are put in a hat and you get two chances to pick a number, without replacement. which formula correctly shows how to find the probability that you choose the number 1 and then 2?

Given: ab ≅ bc and ao ≅ oc ok − angle bisector of ∠boc find: m∠aok