Help please

look at the picture above

Given a circle with a radius of 2 which is the length of an arc measuring 75

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?

On a architect's drawing of a house, 1 inche representa 1.5