Mixed numbers between 5 and 7, with an interval of 1 / 3 between each pair of mixed numbers

The figures below are made out of circles, semicircles, quarter circles, and a square. find the area and the perimeter of each figure and give your answers as a completely simplified exact value in terms of π (no approximations).

What is the missing reason in the proof? segment addition congruent segments theorem transitive property of equality subtraction property of equality?

I’m still confused on how to work the percentages