How to find the volume of fractions and prisms

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?

What is a possible solutions of the x> 3?

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)