If you are facing east and you turn 90 degrees to your right in what direction are you now facing

Need solving this second acceleration problem.

The pyramid shown has a square base that is 24 centimeters on each side. the slant height is 16 centimeters. what is the lateral surface area?

Ab and bc form a right angle at point b. if a= (-3,-1) and b= (4,4) what is the equation of bc?