Find the missing length for the pair of similar figures.

The parabola opens: y=√x-4 (principal square root) up down right left

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).

For the inequality |c| < |d| to be true, which of the following must be true?