#11: angle ABX is 1/2 of angle ABC right?
#21c: parts A & C were constrained to a plane...part C is considering space not just a plane...think of an axle.
#29-32: if you don't have a metric ruler (centimeters) use inches instead...
#27: a 45 degree angle is half a 90 degree angle right? What does perpendicular mean? Can you bisect an angle?
#28: this one is tough...the bigger the triangle, the easier it is. Just take it slow and easy.
#29-32: in these problems you are trying to decide if you could make a triangle using segments of the indicated length.
#33c: so what was the measure of each angle of this equilateral triangle? ...and you know how to bisect an angle right?