PLZZ help use the table to help u solve the equation don't forget to explain why

You are assembling pieces of an iron gate to complete a fence. the finished gate will look like the one below. in order to assemble the gate it is important to under how the pieces are related. part 1: how are pies 1 and 2 in the archway related? part 2: how are the rectangular sections 5 and 6 in the center of the gate related to each other?

Which of the following answers is 7/9 simplified? 7/9 2/9 11/9 2/7

The distance of a chord from the centre of a circle is 12cm and the lenght of the chord is 10cm. find the radius of the circle