Find the value of the pronumeral in the diagram

Tiara buys the pizza shown below: a circular pizza is shown. the edge of one slice is marked ab. what does the curve ab represent?

Two streets intersect at a 30- degree angle. at the intersection, the are four crosswalks formed that are the same length. what type of quadrilateral is formed by the crosswalks?

For the following geometric sequence, find the recursive formula. {-80, 20, -5, } i need : ')