Someone help out with this

Which basic geometric term has no width, no length, and no thickness? line b. point c. angle d. plane

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

Louis wants to carpet the rectangular floor of his basement.the basement has an area of 864 square feet.the width of the basement is 2/3 it's length. what is the length of louis's basement