Find the reference angle when o= 420 degrees a) 30 degrees b) 45 degrees c) 50 degrees d) 120 degrees

Consider the unit circle, with the number of degrees, from 0 to 360, describing the counterclockwise rotation. 360 degrees is one complete revolution (back to the original point, 0°). Therefore, let's subtract 360 from 420 to see where we would end up on the unit circle:
420 - 360 = 60° 
In the first quadrant (0 - 90° on the unit circle), the reference angle is equal to the angle itself. In this case, the reference angle is 60°. Answer is not included, which indicates there may be an transcription error in the problem.

You have 2 sides that are 2 cms and you have 6 sides that are 1/2 cm and you have 4 sides that are 1 cm. the smallest sides are 1/2 the medium sized sides are 1 and the smallest are 1/2. so to find the perimeter you have to add them all up together so your answer will be 11 cm's