Explain how to find the volume of a triangular pyramid. (Explain the steps)

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?

Can someone me i’m confused. will give brainliest and a whole bunch of points

Find the center and the radius of the circle with the equation: x^2-2x+y^2+4y+1=0?