How to find the missing angle of a parallelogram only knowing 1 number?

225/100 of last years cost. write each fraction as a decimal and as a percent

Use the diagonals to determine whether a parallelogram with vertices u(2,−2), v(9,−2), w(9,−6), and x(2,−6) is a rectangle, rhombus, or square. give all the names that apply.

Complete the equation of the line through (−10,3) and (−8,−8). use exact numbers.