Write a proof to prove that angle BOA and angle COD are congruent

Turner's mom measured his room to see how long the wallpaper border needed to be. if two walls are 15 feet long and two walls are 12 feet long, how long should the strip of border be cut?

Write a function for a rotation 90 degrees counter clockwise about the origin, point 0

Solve for x: 5/3 x = 20/21 it's fraction. remember to simplify your fraction